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Ignoring this heterogeneity, as 'modern macro' does, is a likely source of systematic error. The goal is to deduce the distributions of economic characteristics that describe the system as a whole. This puts more emphasis on statistical properties and less on the internal decision making of each agent.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.