When economists defined trade-off, they measured opportunity cost. Trade-off is letting go something of value in exchanging for something else that still has some value.
unemployment
it's forgone consumption.
That part of after-tax income which is not consumed.
on a historical basis
the amount of a good that is bought
price indicator
Economists measure a nation's standard of living: by calculating GDP per person by calculating per capita income (the best indicator) by calculating average personal income.
it is easier for economists to measure "cost" than "opportunity cost"(because people's tastes are different and changeable)
the number of telephones it has in relation to its population.
Economists measure a nation's standard of living: by calculating GDP per person by calculating per capita income (the best indicator) by calculating average personal income.
define how you measure the size of the economy
Population