Why do economists measure the cost or money price of things when opportunity cost is what we actually are considering when we deciding whether or not to purchase?

Rank the following from most to least devasting: ordovician,permaian,cretaceous, pleistocene

Say a certain manufacturing industry has 63.1 thousand jobs in 2008, but is expected to decline at an average annual rate of 1.7 thousand jobs per year from 2008 to 2018. assuming this holds true, what will be this industry’s percent change from 2008 to 2018? a. 70% b. -27% c. -17% d. -75%

Social darwinism applies what theory to human society