What is the chief economic problem economists try and answer? * O The problem of scarcity.
O
The problem of remote learning.
The problem of supply and demand.
O The problem of the circular flow.

Which statement is a good description of a model? a) models are a description of nature based only on one or two variables. b) models are testable ideas but they are not very to most people. c) models are a description of nature that predicts more accurately than real events. d) models are an approximiation of a real system that omits all but most essential variables in a system.