Mass production made manufactured items less expensive due to increased efficiency and economies of scale, primarily due to the assembly line technique. This significantly reduced production costs compared to handmade items. Thus, the correct choice is A: Mass-produced items were less expensive.
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Mass production significantly lowered the cost of manufactured items due to increased efficiency and scale. As a result, mass-produced goods became less expensive compared to handmade items. An example is the automobile industry, where prices dropped with the introduction of assembly lines. ;