The correct answer is: C. economic growth
The general theory posited by supply siders is that the key to economic growth is the ability of businesses to supply products to the market.
This has been generally disproven.
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John Cabot
Sir Martin Frobisher
John Davis
Henry Hudson
William Baffin
Thomas James
Luke Foxe
William Moor
Francis Smith
Samuel Hearne
James Cook
Sir Alexander Mackenzie
Sir John Ross
Sir William Edward Parry
Sir John Franklin
Sir James Clark Ross
John Rae
Sir Francis Leopold M'Clintock
Roald Amundsen
Answer:
It is the Industrial Revolution