Artifact Essay Example | Topics and Well Written Essays - 1000 words

Artifact - Essay Example The object has an approximate height of 5 inches; the widest portion of its body has a width of 4 inches, and the three legs have equal height of 3.5 inches. The object’s width is much bigger than its height and one can inscribe it within a form of a rectangle. The primary raw material used to produce the object is wood. The top part is in a circular shape and is firm since it is of a thick wood material. The thickness of this top part is of approximately 2 inches. The surface area of the top part is big enough to allow for anybody sit comfortably on the chair. The legs are firm enough and forms a u-shape to enable them support the weight of the top part firmly and therefore if anyone sits on the stool no matter how heavy he or she is chances of the stool breaking are limited. The wood materials used to construct the object are curved smooth. The object’s top part has two-fit horizontal lines at the part where the top rests and joins the three legs and the other line is at the surface where an individual sits. When one views this object from a side the stool seems to present some V-shapes formed by each two legs. The objects legs are separate from one another at an equal interval and points downwards supporting the top surface. The legs are thick enough to ensure maximum support of the weight of the top part, which seems to be heavy. When one looks at the object from its top, the stool’s top surface seems to present a disc-shape. This means that much of the weight exerted on the stool is supported by the core and the central part of the stool and that why the legs are joined at the outermost part of the top surface for the purpose of maintain balance when an individual sits on the object. This object however consists of four distinctive parts, which include the top body and the three legs. While the legs of the object are in the form of a long rod, its upper portion is in a disc-shape. The top of the object is in

Legal and Ethical Issues in the Workplace Essay

Legal and Ethical Issues in the Workplace - Essay Example Such an environment guarantees success of the goal. Leaders of an organization are expected to lead higher standards of morality in a workplace. It has been observed that companies that observe ethical decisions show more productivity by employee and turnover ratio is very low. It has also been observed that companies who observe ethical decisions just because they have to be complied to are usually hostile environments and human resources seldom wish to retain in such companies (â€Å"Ethics in the Workplace Training Helps Employees Understand their Personal Obligations  » Workplace Answers†, n.d.). In order to protect the moral standards of a work place and to ensure that people are happy to work together, laws are put in place. These laws comprise of explaining a code of conduct and some ethical policies. Consequences of violation of these laws are also elaborated in these laws. This check and balance ensures that people know their rights and decide to work in a way that will not put them into serious legal complications. The consumers benefit from an ethical environment as well. They become loyal customers of the brand when they realize that the company keeps its integrity intact by displaying a good sense of responsibility (â€Å"Ethics in the Workplace Training Helps Employees Understand their Personal Obligations  » Workplace Answers†, n.d.). Alcohol and drug usage is a concern at work places as its usage is synonymous to an irresponsible attitude. A serious attitude is required at workplace. It has been observed that people who use drugs or alcohol tend to take more leaves from office and hence are not regular employees. Another study reveals that the productivity declines with the usage of alcohol or drugs. It is estimated that people who use it are ten to sixty percent less likely to perform well as compared to people who do not indulge in it. It is also known that drug abuse and excessive alcohol usage calls for frequent accidents ( Raskin, 1993, p. 45-81). This may result in legal complications. Employees feel being accused if they are asked to get themselves checked at workplace. They find it a breach in their privacy and do not accept the test as socially important. They also feel being controlled. There is a need to make them understand that this measure is taken as a safety precaution majorly. They should be discouraged from discriminating people. They should be trained to encourage the impacted colleagues to stop its usage when coming to work and to lead a healthy life by controlling the abuse. Employees are usually monitored at work places by using cameras or even key loggers on their systems. Employers feel that they are gaining knowledge about their business this way. They think it will help them maintain this knowledge. It is suggested in research that the monitoring should be transparent and people should be made accountable to maintain knowledge effectively and not be secretly monitoring it. It has been estimated that a company that has 500 employees that spend time on internet for half an hour a day, the loss the company bears is approximately one million dollars (Yerby, 2013, p. 45-48). On the other hand labor unions claim that electronic monitoring induces stress in the work place and makes the organization use it in negative ways against the employers too. They use emails for communication

Jurisprudence Assignment Question Essay Example | Topics and Well Written Essays - 2500 words

Jurisprudence Assignment Question - Essay Example Antigone decided to defy the proclamation that her brother not be buried properly, and gave him a burial against the state's wishes. After this she was imprisoned and hanged herself in her prison (Sophocles). Natural Law According to Stoner (1992),1 the story of Antigone is one in which the individual is entitled to break the law. He cites Thomas Hobbes as distinguishing between right and law (ius and lex) – right being the basis for liberty and law being the basis for obligation. ... be seen as unjust if it does not accord with God’s laws.   6 Hobbes, according to Stoner (1992) also states that there are limits to the law, or, rather, that there are limits as to what an individual is expected to obey. Hobbes believes, essentially, that man has liberty to decide for himself what is right for himself as an individual – â€Å"the Liberty each man hath, to use his own power, as he will himselfe, for the perservation of his own Nature; that is to say own Life; and consequently, or doing anything, which in his own Judgement, and Reason, hee shall conceive to be the aptest means thereunto.†7 Finnis (2001) would concur in this analysis, stating that governmental laws are limited, in that they must recognize certain universal, God-given rights – such as the right not be murdered, raped, enslaved or lie-to. 8 Further, Stoner (1992) states that Hobbes’ philosophical underpinnings of the law is moral, as opposed to civil or political, as it is directed at the individual, and what is right for every individual, as opposed to the collective. The preservation of the individual is at the heart of the Hobbes’ philosophy. Hobbes’ philosophy, according to Stoner, does not even take the mores and customs of a community into account, because custom is not necessarily anchored to morality or liberty.9   In one thinks about this, it makes sense   - just as slavery was a custom, it clearly was in contravention to natural law or liberty, therefore, the custom of slavery is one that is built upon uncertain ground, like sand.   That said, according to Cornish & Clark (1989), Hobbes recognized that man’s nature was prone to violent destruction, so society must keep a check on the individualistic natures.10   Because natural law is inevitably based upon some

Artifact Essay Example | Topics and Well Written Essays - 1000 words

Artifact - Essay Example The object has an approximate height of 5 inches; the widest portion of its body has a width of 4 inches, and the three legs have equal height of 3.5 inches. The object’s width is much bigger than its height and one can inscribe it within a form of a rectangle. The primary raw material used to produce the object is wood. The top part is in a circular shape and is firm since it is of a thick wood material. The thickness of this top part is of approximately 2 inches. The surface area of the top part is big enough to allow for anybody sit comfortably on the chair. The legs are firm enough and forms a u-shape to enable them support the weight of the top part firmly and therefore if anyone sits on the stool no matter how heavy he or she is chances of the stool breaking are limited. The wood materials used to construct the object are curved smooth. The object’s top part has two-fit horizontal lines at the part where the top rests and joins the three legs and the other line is at the surface where an individual sits. When one views this object from a side the stool seems to present some V-shapes formed by each two legs. The objects legs are separate from one another at an equal interval and points downwards supporting the top surface. The legs are thick enough to ensure maximum support of the weight of the top part, which seems to be heavy. When one looks at the object from its top, the stool’s top surface seems to present a disc-shape. This means that much of the weight exerted on the stool is supported by the core and the central part of the stool and that why the legs are joined at the outermost part of the top surface for the purpose of maintain balance when an individual sits on the object. This object however consists of four distinctive parts, which include the top body and the three legs. While the legs of the object are in the form of a long rod, its upper portion is in a disc-shape. The top of the object is in

Jurisprudence Assignment Question Essay Example | Topics and Well Written Essays - 2500 words

Jurisprudence Assignment Question - Essay Example Antigone decided to defy the proclamation that her brother not be buried properly, and gave him a burial against the state's wishes. After this she was imprisoned and hanged herself in her prison (Sophocles). Natural Law According to Stoner (1992),1 the story of Antigone is one in which the individual is entitled to break the law. He cites Thomas Hobbes as distinguishing between right and law (ius and lex) – right being the basis for liberty and law being the basis for obligation. ... be seen as unjust if it does not accord with God’s laws.   6 Hobbes, according to Stoner (1992) also states that there are limits to the law, or, rather, that there are limits as to what an individual is expected to obey. Hobbes believes, essentially, that man has liberty to decide for himself what is right for himself as an individual – â€Å"the Liberty each man hath, to use his own power, as he will himselfe, for the perservation of his own Nature; that is to say own Life; and consequently, or doing anything, which in his own Judgement, and Reason, hee shall conceive to be the aptest means thereunto.†7 Finnis (2001) would concur in this analysis, stating that governmental laws are limited, in that they must recognize certain universal, God-given rights – such as the right not be murdered, raped, enslaved or lie-to. 8 Further, Stoner (1992) states that Hobbes’ philosophical underpinnings of the law is moral, as opposed to civil or political, as it is directed at the individual, and what is right for every individual, as opposed to the collective. The preservation of the individual is at the heart of the Hobbes’ philosophy. Hobbes’ philosophy, according to Stoner, does not even take the mores and customs of a community into account, because custom is not necessarily anchored to morality or liberty.9   In one thinks about this, it makes sense   - just as slavery was a custom, it clearly was in contravention to natural law or liberty, therefore, the custom of slavery is one that is built upon uncertain ground, like sand.   That said, according to Cornish & Clark (1989), Hobbes recognized that man’s nature was prone to violent destruction, so society must keep a check on the individualistic natures.10   Because natural law is inevitably based upon some

Carbonate and hydrochloric acid Essay Example for Free

Carbonate and hydrochloric acid Essay If you have a two fixed masses of hydrochloric acid, which have both been crushed up, the one with the smaller particles will have a higher rate of reaction, due to the fact that there is a higher surface area exposed to the hydrochloric acid. A good example to compare this to would be slicing a loaf of bread, then spreading butter on it. The more thinner you cut each slice of bread, the more you can get which means that you would be able to spread more butter. This type of theory is known as the bread and butter theory and is often used in biology. The higher surface area of marble chips there is that is in contact with the hydrochloric acid, the higher the rate of reaction, and the more products that are formed in a given amount of time. Light Some chemical reactions are affected by the presence of light. One example of a reaction that depends on the presence of sunlight is photosynthesis, which only takes place when sunlight falls on a plant, which contains green pigmentation called chlorophyll. Another example of a reaction that only takes place in the presence of light is that which occurs when a photograph is taken. Inside the camera is a transparent film, which a clear plastic film that is covered in an emulsion of a layer of gelatine which is filled with millions of tiny crystals of silver halides, especially silver bromide (AgBr). The emulsion that is used is similar for both colour and black and white film. The only difference is that the colour film contains three layers of emulsion which all contain different dyes. When light falls hits a silver bromide molecule, silver cations (Ag+) accepts an electron from the bromine ions (Br-) creating a silver atom. Ag+ + e- Ag Silver ion + Electron Silver atom The bromine atoms that are produced are then trapped in the gelatine. The more light that hits the photographic film the greater the amount of silver that is deposited. As you can see, most of the ways of increasing the rate of reactivity involve increasing the number of successful collisions within the reaction itself. Once you do this the rate of reaction should increase. However, just increasing the number of collisions doesnt necessarily mean that the rate of reaction is increased. This is because in order to increase the rate of reaction you need to increase the number of successful collisions. When collisions occur, if they do not have enough energy, which is in the form of kinetic energy, then they would repel each other. However if they do have enough energy, then they would combine, which is a successful collision. The way in which the rate of reaction is calculated is by using the following formula: Reaction rate= change in amount (or concentration) of a substance/products produced Time taken Therefore, in this case, I will be measuring the rate of reaction by measuring the quantity of products formed. The formula would then be: Reaction rate= carbon dioxide produced. Time taken Using this method you can work out the average rate of reaction between calcium carbonate and hydrochloric acid in the time given for the experiment. The rate at which it reacts would be measured in x grams/minute. Aim The aim of this experiment is to see how the rate of reaction can be affected by a factor [variable]. The variable that we chose was the concentration of the acid, so the aim is to see how the concentration of hydrochloric acid can affect the rate of reactivity. Prediction Substances are prone to burn much faster in the presence of oxygen. For example a charcoal in a barbeque would often be burning quite slowly with a red glow. However, when you blow on t, the coal would become even hotter as it gets more red, and my even burst into flames. This is as you are blowing a higher concentration of oxygen onto it. Another example is acetylene, which burns extremely rapidly in the presence of pure oxygen. The energy produced, in the form of heat, is enough to burn through metal, which is what it is used for: C2H2 + 2. 5O2 2CO2 + H2O + heat Acetylene + Oxygen Carbon dioxide + Water + heat energy. Chemical reactions occur when successful collisions occur between particles. This is when particles gain enough speed that when they collide with each other they join together. Successful collisions between acetylene molecules and oxygen molecules occur when pure oxygen is used instead of air. Therefore, the rate of reaction increases the rate of reaction as well as increasing the amount of heat given off. From this, I can therefore predict that as you increase the concentration of the hydrochloric acid, you would also be increasing the rate of reaction. I predict that the shape of the graph would look like so: This is as the rate of reaction at the beginning would be quite rapid. This would eventually slow down due to the fact that the calcium chloride and the hydrochloric acid are being used up. I therefore predict that the shape of the graph would eventually level off, and all of the lines (the concentrations) should end up at the same level in the end. Preliminary Investigation There are two methods that may be used to measure the rate of reaction, which are: * How fast the reactants are used up. How fast the products are formed The method we are using is to measure how fast the products are formed; in this case how fast the carbon dioxide is formed. Preliminary experiments were performed beforehand to understand how the actual experiment should be carried out, decide on the quantities of substances used as well as comprehend the observations in the experiment, i. e. effervescence, in order to acknowledge the reaction. First, we had to decide on the concentration of hydrochloric acid used. The fist concentration that was tried was 3 molar, which I decided was too fast. This was as the reading on the gas syringe went above the maximum level quite rapidly, which is not sufficient as it means that the results would not be adequate enough to identify a trend, which is the main aim of this investigation. The next concentration level that was tried was 2 molar, which I decided was adequate enough for the maximum concentration. Even though the reading in the gas syringe did go above the maximum, I did keep in mind that I was going to be using a larger gas syringe for the actual experiment. Therefore the maximum concentration of acid that is going to be used is 2 molar, which is the variable. We are then going to reduce this to 1. 8 molar, 1. 6 molar, 1. 4 molar, 1. 2 molar and then finally 1 molar. I believe that these sets of variables would be adequate enough in order to identify a trend. After deciding on the quantities used, I then had to decide what volume of acid I was going to be using. The first volume I tried was 0. 5ml, which was too slow. I then tired 10 ml, which was again proving to be quite a slow reaction. So I then doubled the volume of the acid, which I believed was satisfactory, as the rate of reaction was good, and the amount of co2 produced was satisfactory, as it did not go over the syringe limit. I then had to decide what mass of calcium carbonate chips I had to use. The first mass that I had tried was 0. 5grams, which produced a far too slow rate of reaction. I then tried 2 grams of calcium carbonate, which was too fast of a reaction, and the amount of CO2 produced was off the reading on the gas syringe, so I halved it to 1 gram, which was satisfactory. The amount of time I am going to use is 90 seconds (one and a half minutes) as I believe that this is a sufficient amount of time in which I will be able to identify any trend between the concentration of hydrochloric acid and the amount of carbon dioxide produced. Here are the results for the volume of acid: Concentration of acid: 1M Mass of marble chips: 1. 0 gram Volume of acid used: 5 ml. Time (s) Concentration of acid: 1M Mass of marble chips: 1. 0 gram Volume of acid: 10 ml Time (s). Concentration of acid: 1M Mass of marble chips: 1. 0 gram Volume of acid: 20ml TConcentration of acid: 1M Mass of marble chips: 1 gram Volume of acid: 20ml Time (s) + Here are the results for the concentration of hydrochloric acid: Concentration of acid: 2M Mass of marble chips:1 gram Volume of acid: 20ml Time (s) 2 produced (cm3) + Concentration of acid: 1M Mass of marble chips: 1 gram Volume of acid: 20ml Time (s)(cm3)Â   The overall result for the preliminary investigation using the correct quantities would be: Time (s) 1 produced (cm3) with 1MÂ   The graph for the preliminary investigation looked like this: Show preview only The above preview is unformatted text This student written piece of work is one of many that can be found in our GCSE Patterns of Behaviour section.

International Trade Structure

International Trade Structure Examine the International Trade Structure. Do you accept Krasners Argument for an Open Trade Regime? Address his Desire for a Hegemon. Now that todays world is more of a global village, international trade has become institutionalized not only by economic factors, but also non-economic factors. Trade is not solely based on commercial objectives rather politics also plays a dominant role in it. ‘Much of the international trade system both drives and reacts to national, political, fiscal and monetary policies (Hanink 1989: 268). As a result, there are new emerging problems and concerns that have come up in the international trading structures (Boger 1958: 1753). ‘The international system is anarchical†¦sovereign states are rational self-seeking actors resolutely if not exclusively concerned with relative gains (Krasner 1992: 39). Trade usually takes place keeping in view the classical principles of opportunity cost, factor endowment theory and comparative advantage where, ‘each country specializes in those branches of production in which it has a comparative advantage, or in other words produce those goods whose costs are relatively lowest (Ellsworth 1940: 286-287). However, the international trade system can best be regarded as a situation of prisoners dilemma under which the best outcome for an individual player is for that player to cheat by for instance imposing an optimal tariff, while the other player cooperates. However, if both players cheat, they will be worse off than if both had cooperated (Goldstein, Krasner 1984: 284). Experimental findings suggest that the winning strategy for this sort of a situation is the Tit for Tat strategy ‘in which the player cooperates on the first move and then does whatever the other player did on the preceding move (Goldstein, Krasner: 1984: 284). In their views, such a strategy is not meant to start a trade war rather its aim is to promote cooperation and freer trade (1984: 284). The prisoners dilemma depiction also ‘claims that a stable system of international free trade involves the supply of a public good. Such goods are joint in supply and non-excludable (Gowa 1989: 1245). This public good may be one or numerous depending upon the case. These public goods include political stability, regional stability, liberal economies etc. After the second World War the emphasis of the trade regime was to regulate all trade distortions. ‘Liberal rules, norms and procedures were to be adopted by states and patrolled by international organizations (Goldstein, Krasner 1984: 282). But in todays world, ‘the bulk of international trade takes place between the industrialized or rich countries. This pattern of trade is in contradiction to the factor endowment theory because trade is taking place between countries with similar, rather than dissimilar, factor (capital) endowments (Hanink 1988: 323). The international trade structure is also characterized by the hegemonic stability theory which ‘asserts that an open international trading regime is most likely where there is a single dominant power (Krasner 1992: 40). This view is held by Krasner, Gilpin, Kindelberger and Hirschman. ‘A hegemonic power creates a stable international order and the hegemons decline leads to global instability (Stein 1984: 355). The assumptions of this theory are that the international system is anarchical with nation-states being the dominant actors, the international market is a non-homeostatic market and the nation-states seek to maximize their absolute and relative gains from trade (Lake 1984: 149). It asserts that the hegemon has an incentive to see if the collective good is provided even if the hegemon alone has to bear the full burden of providing it. ‘The hegemonic leader will place a greater, absolute value upon a liberal international economy than others and, as a result, w ill undertake to stabilize the international economy and construct a strong regime (Lake 1984: 146). Because of the provision of public goods, the element of free riders exist. ‘Kindleberger argues that the international political economy will be stable only if a single leader is willing to assume responsibility for maintaining a relatively open market for distress goods; providing counter-cyclical long-term lending; and discounting in a crisis†¦the leader must also undertake to manage in some degree the structure of foreign exchange rates and provide a degree of coordination of domestic monetary policies (Lake 1984: 145). This theory asserts that only large states have the power, capabilities and the responsibility to lead the international economy. ‘A hegemonic leader will place greater absolute value upon a liberal international economy than others and, as a result, will undertake to stabilize the international economy and construct a strong regime in order to ac hieve this goal (Lake 1984: 146). So the hegemon will provide the public good of stability and security because its own benefits far exceed the costs that it has to bear. For the large nation, the larger its size is, the more willing it will be to opt for international stability because of its large relative and absolute gains from trade. ‘The free functioning of the international market is therefore assumed to concentrate wealth in nations of high productivity. Under this assumption highly productive nations will give free play to the functioning of the international market and will favor free trade because they enjoy disproportionate benefits from such trade (Lake 1984: 149). In the case of middle and smaller nations, they too will be in favor of such a system because they too will gain from the trade, although relatively less. ‘The incentives to cheat and become a free rider are great enough that any international regime which depends on collective provision is inherently unstable. Stability can only be assured when a hegemon both bears the cost of providing the collective good and extracts the support of others (Stein 1984: 356). But this theory has some loopholes as well. First, Krasner is concerned with regime formation and trade but he does not take historical context into account while explaining how the free trade regime is established. He mentions ‘that a hegemon uses inducements and force to create or maintain open markets but does not provide a sense of how this occurs (Stein 1984: 357). A hegemon cannot bring about a free trading regime, it can unilaterally lower its own tariffs but this by no means assert that it can create an international trading system of lower tariffs. Tariff bargains only leads to trade liberalization among major trading states. This leads to similar sort of nations trading with each other, especially the powerful trading with one another and the poor nations are discriminated against. ‘It can impose an open trading regime on weak countries, but this too does not create an open regime (Stein 1984: 358). This is evident from the fact that both in the 19th and the 20t h centuries, the hegemonic power accepted compromises but itself deviated from the free trade ideal. ‘The liberal trade regimes that emerged in both the centuries were founded on asymmetric bargains that permitted discriminations, especially against the hegemon. The agreement that lowered tariff barriers led not to free trade, but freer trade. In the process, they legitimated a great deal of mercantilism and protectionism (Stein 1984: 359). Great Britain and the United States had important political motives behind their economic concessions. Also, such economic orders created by trade agreements have been sub systemic rather than global since only some states became parties to such agreements and many were actually excluded from them. They did not even provide collective goods because the non signatory states could be excluded. Thus ‘the systems allowed for discrimination and exclusion, and cannot be considered to have provided a collective good (Stein 1984: 360). ‘The periods dubbed ‘free trade eras certainly saw years of rapid trade expansion, but they were hardly periods of free trade. Rather, they were periods of freer trade (Stein 1984: 383). There was severe discrimination against those outside the system and these systems were based on asymmetric tariff bargains characterized by dumping. Also in the process of evolution, international trade has become institutionalized and non economic factors have become relatively important in evaluating the consequences of changes in the relevant variants (Boger 1958: 1753). ‘Krasner suggests nations may also be interested in additional goals of social stability, political power and economic growth (Lake 1984:145).It is this dramatic change in the structure of the international trading system that has led to the creation of new problems and at the same time, more and different concerns. Although the hegemon does provide collective goods, it only promotes and creates liberal internat ional economic orders because of their own vested interests in open markets and not because of altruism (Stein 1984: 357). ‘The hegemon effectively changes the policies of others to satisfy its own goals†¦the leverage exerted by the hegemon may take many different forms including negative sanctions (threats), positive sanctions (rewards), the reconstructing of market incentives, ideological leadership or simply success worthy of emulation (Lake 1993: 469). So it thus proves that the hegemon will go to any length just to satisfy its own self interests. Bibliography Boger, L.L 1958 Discussion:Trading Problems in International Markets Journal of Farm Economics, Vol. 40, No. 5, pp 1753-1755 http://links.jstor.org/ Ellsworth, P.T 1940 A Comparison of International Trading Theories The American Economic Review, Vol.30, No.2, pp 285-289 http://links.jstor.org/ Goldstein, Judith L. and Krasner, Stephen P 1984 Unfair Trade Practices:The Case for a Differential Response The American Economic Review, Vol. 74, No.2 pp 282-287 http://links.jstor.org/ Gowa, Joanne 1989 Bipolarity, Multipolarity and Free Trade The American Political Science Review, Vol. 83, No. 4, pp 1245-1256 http://links.jstor.org/ Hanink, Dean M. 1989 Introduction:Trade Theories Scale and Structure Economic Geography Vol. 65, No. 4, pp 267-270 http://links.jstor.org/ Hanink, Dean M. 1988 An Extended Linder Model of International Trade Economic Geography Vol. 64, No. 4, pp 322-334 http://links.jstor.org/ Krasner, Stephen P. 1992 Realism, Imperialism and Democracy: A Response to Gilbert Political Theory Vol. 20, No. 1, pp 38-52 http://links.jstor.org/ Lake, David A. 1993 Leadership, Hegemony and the International Economy: Naked Emperor or Tattered Monarch with Potential? International Studies Quarterly Vol. 37, No. 4, pp 459-489 http://links.jstor.org/ Lake, David A. 1984 Beneath the Commerce of Nations: A Theory of International Economic Structures International Studies Quarterly Vol. 28, No. 2, pp 143-170 http://links.jstor.org/ Stein, Arthur A. 1984 Great Britain, the United States, and the International Economic Order International Organization Vol. 38, No.2, pp 355-386 http://links.jstor.org/