Economics is regarded as a science because?

the opportunity cost of a worker going to the university  is

which of the following items is not an example of circulating capital

in a market economy, the problem of what goods to produced is solved primarily by

if the weight of five puppies in kilograms are 3.5, 3.0, 4.2, 5.0 and 4.3, then mean weight of the puppies is?