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61.
Conformity testing is a systematic examination of the extent to which an entity conforms to specified requirements. Such testing is performed in industry as well as in regulatory agencies in a variety of fields. In this paper we discuss conformity testing under measurement or sampling uncertainty. Although the situation has many analogies to statistical testing of a hypothesis concerning the unknown value of the measurand there are no generally accepted rules for handling measurement uncertainty when testing for conformity. Usually the objective of a test for conformity is to provide assurance of conformity. We therefore suggest that an appropriate statistical test for conformity should be devised such that there is only a small probability of declaring conformity when in fact the entity does not conform. An operational way of formulating this principle is to require that whenever an entity has been declared to be conforming, it should not be possible to alter that declaration, even if the entity was investigated with better (more precise) measuring instruments, or measurement procedures. Some industries and agencies designate specification limits under consideration of the measurement uncertainty. This practice is not invariant under changes of measurement procedure. We therefore suggest that conformity testing should be based upon a comparison of a confidence interval for the value of the measurand with some limiting values that have been designated without regard to the measurement uncertainty. Such a procedure is in line with the recently established practice of reporting measurement uncertainty as “an interval of values that could reasonably be attributed to the measurand”. The price to be paid for a reliable assurance of conformity is a relatively large risk that the procedure will fail to establish conformity for entities that only marginally conform. We suggest a two‐stage procedure that may improve this situation and provide a better discriminatory ability. In an example we illustrate the determination of the power function of such a two‐stage procedure. 相似文献
62.
Using a unique survey data on agricultural traders in China in 2004, this study provides direct evidence on the significance of inter-regional trade barriers and their key components. Our major findings are as follows. (1) The trade barriers within China are fairly small, accounting for about 20% of trade value. (2) Transport and non-transport costs respectively contribute 42% and 58% to the trade barriers. (3) Labor and transport-related taxes are the two largest proportions of total transport costs, and respectively account for 35% and 30%. (4) Artificial trade barriers created by the government are not sizable as we perceived. (5) Road quality is crucial for reducing transport costs within China: increasing transport speed by 1 km per hour, the total transport costs for Chinese agricultural traders would decrease by 0.6%, mainly due to improved fuel-burning efficiency and reduced labor requirement. 相似文献
63.
Despite evidence that information technology (IT) has recently become a productive investment for a large cross-section of firms, a number of questions remain. Some of these issues can be addressed by extending the basic production function approach that was applied in earlier work. Specifically, in this short paper we: 1) control for individual firm differences in productivity by employing a ‘firm effects’ specification, 2) consider the more flexible translog specification instead of only the Cobb-Douglas specification, and 3) allow all parameters to vary between various subsectors of the economy. We find that while ‘firm effects’ may account for as much as half of the productivity benefits imputed to IT in earlier studies, the elasticity of IT remains positive and statistically significant. We also find that the estimates of IT elasticity and marginal product are little-changed when the less restrictive translog production function is employed. Finally, we find only limited evidence of differences in IT's marginal product between manufacturing and services and between the ‘measurable’ and ‘unmeasurable’ sectors of the economy. Surprisingly, we find that the marginal product of IT is at least as high in firms that did not grow during 1988–1992 sample period as it is in firms that grew. 相似文献
64.
Bertrand supergames with non‐binding communication are used to study price formation and stability of collusive agreements on experimental duopoly markets. The experimental design consists of three treatments with different costs of communication: zero‐cost, low‐cost and high‐cost. Prices are found to be significantly higher when communication is costly. Moreover, costly communication decreases the number of messages, but more importantly, it enhances the stability of collusive agreements. McCutcheon (1997) presents an interesting application to antitrust policy by letting the cost of communication symbolize the presence of an antitrust law that prohibits firms from discussing prices. Although our experimental results do not support the mechanism of McCutcheon's (1997) argument, the findings point in the direction of her prediction that antitrust laws might work in the interest of firms. 相似文献
65.
U.S. companies that need capital may choose between selling securities in the private and public markets. These venues differ in terms of direct issuance costs, the required information disclosed, the liability incurred, and the mechanics of the capital-raising process itself. During the last two decades, the Securities and Exchange Commission (SEC) has deregulated private offerings by broadening their investor base and increasing secondary market liquidity. At the same time, SEC policy has bifurcated the offering process in the public market into two distinct segments based largely on company size and seasoning. Large public issuers have seen a gradual deregulation and acceleration of their capitalraising processes. Important changes for issuers include allowing them to incorporate information into registration statements by reference to Exchange Act reports, to use shelf registration to speed up offers, and to place securities offshore with less regulatory uncertainty. Though small issuers enjoy some of the benefits of these changes, deregulation of their offerings has been somewhat less pronounced. In a Commission report and a subsequent concept release, the SEC indicates it may restructure and unify these three disparate strands of capital raising through an innovative schema of registering companies rather than securities. 相似文献
66.
Erik Schokkaert 《Economics Letters》1985,19(1):43-46
Complete demand systems often are estimated under the assumption that preferences are constant. If preferences do change in reality, this leads to a specification error. This note explores some of the implications of such a specification error. 相似文献
67.
68.
Erik Bengtsson 《New Political Economy》2015,20(3):406-430
This paper relates the financial and monetary dimensions of the contemporary economic crisis to working-class agency via a central concern of classical political economy: the distribution of surplus between the chief factors of production. The fall in the wage share of value added is now accepted as a stylised fact in the empirical economic literature. This paper argues that the punctuated pattern of the development validates the regulation theoretical narrative of an epochal shift from Fordism to finance-led accumulation. Furthermore, synthesising econometric studies supports a class-centred explanation. In the last instance, the falling wage share is due to successful transnational class rule in the form of a neoliberal hegemonic paradigm. Crucially, such class rule restructured the environment of trade unions, rendering increasingly ineffective its relational power resources. The paper concludes by considering the contradictory implications for organised labour of the current financial crisis. On the one hand, the financial crisis offers an opportunity to link its particular interests to the general interest of macroeconomic management since low wage share inhibits growth rates. But how might trade unions assert a higher wage share in the face of the structural power of (financial) capital? 相似文献
69.
PROPERTIES OF OPTION PRICES IN MODELS WITH JUMPS 总被引:1,自引:0,他引:1
We study convexity and monotonicity properties of option prices in a model with jumps using the fact that these prices satisfy certain parabolic integro–differential equations. Conditions are provided under which preservation of convexity holds, i.e., under which the value, calculated under a chosen martingale measure, of an option with a convex contract function is convex as a function of the underlying stock price. The preservation of convexity is then used to derive monotonicity properties of the option value with respect to the different parameters of the model, such as the volatility, the jump size, and the jump intensity. 相似文献
70.
We study the relationship between corruption and borrowing costs for governments and firms in emerging markets. Combining data on bonds traded in the global market with survey data on corruption compiled by Transparency International, we show that countries that are perceived as more corrupt must pay a higher risk premium when issuing bonds. The global bond market ascribes a significant cost to corruption: an improvement in the corruption score from the level of Lithuania to that of the Czech Republic lowers the bond spread by about one-fifth. This is true even after controlling for macroeconomic effects that are correlated with corruption. We find little evidence that investors became more sensitive to corruption in the wake of the Asian financial crisis. 相似文献