Why do scientists often review one another's work before it is published?

Adds up the money earned by producers plus taxes paid to the goverment. a) income approach b) product approach c) expenditure approach

The strength of the economy depends on the balance pf production and consumption of goods and consumption of goods and services

What is the relationship between marginal external cost, marginal social cost, and marginal private cost? a. marginal social cost equals marginal private cost plus marginal external cost. b. marginal private cost plus marginal social cost equals marginal external cost. c. marginal social cost plus marginal external cost equals marginal private cost. d. marginal external cost equals marginal private cost minus marginal social cost. marginal external cost a. is expressed in dollars, so it is not an opportunity cost b. is an opportunity cost borne by someone other than the producer c. is equal to two times the marginal private cost d. is a convenient economics concept that is not real