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Cost Theory

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THEORY OF COST
Economists have developed a comprehensive set of theories concerning cost, which they use to describe, explain, and predict the behavior of firms and individuals (e.g., consumers). The field of economics thus provides the underlying theory of costs, while accounting generally supplies most of the data that allow this theory to be applied in practice.
The economist's idea of cost is more useful in analyzing the critical decisions made by management and government.
In order to develop an appropriate costing methodology for a telecommunications service, it is important to understand both the underlying economic theory (and associated terminology) of cost, and the accountant's practical measures of cost (which do not directly correspond to elements of the theory).
Assumptions of theory of cost
Theory of cost rests upon several key assumptions about human behavior and environmental characteristics (Williamson, 1979; Williamson & Ouchi, 1981; Williamson, 1985). These assumptions elucidate why firms may face superior costs for market-based transactions and why firms may be relatively more efficient than markets at organizing transactions. The firm will select the governance form, from the various alternatives amongst the organizational menu, that minimizes transaction and production costs.
Assumptions about human and human behavior
Opportunism with guile. In neoclassical economics, humans are viewed as self-interested; individuals pursue their own self-interest in their own activities (i.e., simple self-interest according to Williamson (1985)).
Opportunism with guile takes this assumption a step further to assume that individuals may engage in behavior that is both subtly and overtly deceitful ex ante and ex post to agreeing on contracts. As Williamson (1985: 48) puts it “Plainly, were it not for opportunism, all behavior could be rule governed”. In

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