How can one determine the expenditure multiplier in an economic model?

To determine the expenditure multiplier in an economic model, you can use the formula: Expenditure Multiplier 1 / (1 - Marginal Propensity to Consume). The Marginal Propensity to Consume is the proportion of additional income that a person or household spends rather than saves. By calculating this ratio, you can understand how changes in spending affect overall economic activity.