A ________ is any activity or benefit offered for sale that is essentially intangible and does not result in the ownership of anything?

A. With a large enough computer, central planners could guide production more efficiently than markets.
B. Market participants act as if guided by an invisible hand to produce outcomes that maximize social welfare
C. The strength of a market system is that it tends to distribute resources evenly across consumers.
D. Taxes help prices communicate costs and benefits to producers and consumers.