In medical research, cross-sectional studies differ from case-control studies in that they aim to provide data on the entire population under study, whereas case-control studies typically include only individuals with a specific characteristic, with a sample, often a tiny minority, of the rest of the population.
(redirected from Variable Expense) Also found in: Dictionary, Wikipedia. A cost that is directly proportional to the volume of output produced. When production is zero, the variable cost is equal to zero. A cost to a person or business that varies over time according to a number of factors.
DEFINITION of 'Discretionary Expense'. A discretionary expense is a cost which is not essential for the operation of a home or a business. For example, a business may allow employees to charge certain meal and entertainment costs to the company in order to promote goodwill with employees. discretionary expense is a cost which is not essential for the operation of a home or a business.