How do the Interests of Commerce differ from the Interests of Individual Merchants?

ONLY THOSE who work on the land or in industry produce something that did not previously exist. Their activities are therefore necessarily always beneficial to society as a whole. (There is one exception to this.) The interests of particular producers may be very seriously injured if their output is too large and if a surplus of goods is thereby created. A temporary slump occurs whenever the supply of a particular product exceeds the demand.