Answer: D. Improvements in production techniques
Explanation:
The 1920s saw an improvement in production techniques that led to the mass production of certain items, chief amongst them the motor vehicle.
People saw the opportunities that mass production could bring and applied it to other products such as radios and the result was a mass production that led to a mass consumption of radio because everybody wanted to own a radio and be connected to the rest of the America and the World.
Explanation:
Settlers used oil as an illuminant for medicine, and as grease for wagons and tools. Rock oil distilled from shale became available as kerosene even before the Industrial Revolution began. While traveling in Austria, John Austin, a New York merchant, observed an effective, cheap oil lamp and made a model that upgraded kerosene lamps. Soon the U.S. rock oil industry boomed as whale oil increased in price owing to the growing scarcity of that mammal. Samuel Downer, Jr., an early entrepreneur, patented “Kerosene” as a trade name in 1859 and licensed its usage. As oil production and refining increased, prices collapsed, which became characteristic of the industry.
Answer:
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Explanation:
wasd
