Select factors contributing to efficient production. mass production
stockholders
standardized parts

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Explanation:

mass production:

Anything consumers needed or desired could be made in larger quantities. Mass production resulted in lower prices of consumer goods. Eventually, economies of scale resulted in the most affordable price of any product for the consumer without the manufacturer having to sacrifice profits.

stockholders:

A common problem that arises for companies with numerous stakeholders is that the various stakeholder interests may not align. In fact, the interests may be in direct conflict. For example, the primary goal of a corporation, from the perspective of its shareholders, is to maximize profits and enhance shareholder   valueSince labor costs are unavoidable for most companies, a company may seek to keep these costs under tight control. This is likely to upset another group of stakeholders, its employees. The most efficient companies successfully manage the interests and expectations of all their stakeholders.

standardized parts:

Interchangeable parts, popularized in America when Eli Whitney used them to assemble muskets in the first years of the 19th century, allowed relatively unskilled workers to produce large numbers of weapons quickly and at lower cost, and made repair and replacement of parts infinitely easier

mining and farming towns developed

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yellow fever and other tropical diseases