Competition and Cost Accounting: Adapting to Changing Markets*
实验研究个体如何根据市场竞争程度（垄断、双头垄断、四企业竞争）及其变化历史，选择产品成本的核算精度，发现垄断时数据收集最多，双头垄断时最少，且市场历史影响适应能力。
Abstract The relation of competition and cost accounting has been the subject of conflicting prescriptions, theories, and empirical evidence. Practitioner literature and textbooks argue that higher competition generally requires more accurate product costing. Theoretical economic analysis, in contrast, predicts that the optimal level of product‐costing accuracy is sometimes higher at lower levels of competition. Results of survey research are inconsistent, suggesting a need for further identification of conditions under which higher competition leads to more accurate product costing. This study shows experimentally that individuals' choices of the level of product‐costing accuracy depend not only on the current level of competition but also on the previous level of competition — that is, on an interaction between market structure (monopoly, duopoly, and four‐firm competition) and market history (increasing versus decreasing competition). In the experiment, subjects decide on the quantity of data to collect at a pre‐set price per datum to support more accurate product‐cost estimates. Subjects collect the most cost data (i.e., choose the most accurate product costing) in monopoly, collect the least in duopoly, and an intermediate amount in the four‐firm market, consistent with the pattern of optimal cost‐data collection in Hansen's 1998 model. The process of convergence to the optimum differs significantly across market types and market histories, however. Subjects who begin in four‐firm competition adapt more successfully to change than those who begin in monopoly. The lowest levels of decision performance occur when ex‐monopolists face their first competitor: they overreact to this first encounter with competition and overspend on cost data.