Which development of the 1920s was caused by the increase in time-saving household inventions such as the washing machine and vacuum cleaner?

Washing machines and vacuum cleaners reduced the time people needed to spend on household chores. The extra free time helped make leisure activities, including going to the movies, more popular. These inventions did not directly increase manufacturers’ ability to produce goods at lower costs, so the best answer is increased popularity of new and exciting entertainment events such as movies.

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