Concept:An economy where part of income is saved rather than spent on consumption is described as a frugal economy.Explanation:If total income is Y, and it is not all consumed, then part is saved or invested.This can be written as Y=C+S or Y=C+I.Here, C is consumption, S is saving, and I is investment.A frugal economy avoids spending the entire income and instead sets aside a portion for the future.Thus, the correct term for an economy where whole income is not consumed is a frugal economy.Answer:A. Frugal economy