Answer:
Step-by-step explanation:
The choices are:
- increase in the price of rubber (tires)
- a tax on businesses that goes into effect immediately
- scientists find a way to make solar panels more efficient at no extra cost
- vast increase in hurricanes in the Caribbean (oil)
- the closing of 70% of a town’s restaurants
The increase in price, tax, hurricanes and closing of restaurants will all reduce supply and shift the supply curve LEFT.
So the only answer left and also the correct answer is - scientists find a way to make solar panels more efficient at no extra cost.