When moving along a consumer's budget constraint, what remains constant?

When moving along a consumer's budget constraint, the prices of the goods and the consumer's income remain constant. A budget constraint illustrates the trade-offs a consumer faces with limited income and fixed prices of goods. It reflects the maximum quantity of goods that can be purchased given the consumer's income and the prices of those goods.

As a consumer moves along this budget line, they are determining different combinations of two goods they can buy, depending on how they wish to allocate their income. Because the budget constraint is derived from specific prices and income levels, these factors do not change as the consumer makes choices along the constraint.

Other aspects, such as consumer preferences, may influence the selection of those combinations but do not have an effect on the budget constraint itself. Additionally, the quantities of goods consumed will change as the consumer shifts their spending from one good to another along the constraint, not remaining constant.