Suppose over the next several years the productivity of firms producing electric cars improves dramatically. The advance in productivity leads to
A) a decrease in the supply of electric cars so that the supply curve shifts rightward.
B) an increase in the supply electric cars so that the supply curve shifts rightward.
C) an increase in the supply of electric cars so that the supply curve shifts leftward.
D) a decrease in the supply of electric cars so that the supply curve shifts leftward.
E) no change in the supply of electric cars, only a change in the quantity supplied of electric cars.
Question 2
The annual growth rate of an economy is 10 percent. The economy's GDP will double in about ________ years.
A) 12 B) 10 C) 20 D) 7 E) 14
(a) The site of Zhoukoudian outside of Beijing, China, spans several hundred thousand years and (b)
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How long does it take for 90% of a sample of strontium-90 (half-life of 28.8 years) to decay?
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