A student is using a standard two-period consumption-savings model. A key feature of this model is the simplifying assumption that the general level of prices for all goods and services remains constant from one period to the next. If a bank offers a savings account with an annual interest rate of 4%, what is the effective increase in the purchasing power of the saved funds after one year, according to the assumptions of this specific model?

Rationale for a Simplifying Assumption in Economic Models

In a simplified economic model of consumption over two periods where the general price level is assumed to remain unchanged, if a financial institution offers a 3% annual rate on savings, the actual growth in a consumer's purchasing power from those savings will be exactly 3%.

Evaluating a Model's Core Assumption

Applying a Simplified Savings Model

Within an economic model that simplifies decision-making over time by assuming that the general price level remains constant, the interest rate quoted by a financial institution is effectively the same as the true increase in purchasing power. This quoted rate is known as the ________ interest rate.

An economic model is used to understand how a person makes choices about spending and saving over time. Match each scenario described below with the correct relationship between a bank's quoted interest rate and the actual growth in a saver's purchasing power.

An economist is constructing a basic two-period model to analyze a consumer's savings decisions. A foundational assumption of this model is that the overall price level of goods and services does not change between the first and second periods. If a bank in this model's economy offers a 5% interest rate on savings, how does this rate relate to the actual change in the consumer's ability to purchase goods in the second period with their saved money?

Consequences of a Simplifying Assumption