What concept assumes that the dollar's purchasing power is relatively stable?

The Stable-Monetary-Unit Concept is foundational in accounting and appraisal practices, assuming that the value of money remains consistent over time. This concept allows for reliable comparisons of values, cost assessments, and financial reporting since it treats the monetary unit as a constant in terms of purchasing power. By assuming that the dollar's purchasing power does not fluctuate significantly, appraisers and accountants can maintain consistency in their measurements and evaluations. This stability is crucial for making sound decisions in financial analyses and property assessments, as it provides a reliable basis for comparing data across different time periods without adjusting for inflation or other variations in value.

The other concepts listed do not relate to the assumption of stable purchasing power. The Capitalization Threshold pertains to the minimum value at which income-producing properties are analyzed for investment purposes, Appraising Depreciation focuses on assessing the loss in value of assets over time, and the Income Statement is a financial report summarizing revenues and expenses of a business during a specific period. None of these concepts specifically addresses the stability of the purchasing power of the dollar as the Stable-Monetary-Unit Concept does.