This question is about the market for STM tickets.
Which of the following events will not shift the demand curve to the left?

Question

This question is about  the market  for STM tickets. 
 Which of the following events will  not  shift the demand curve to the left?

Answer

Successful advertisement by STM.

Answer

A decrease in the price of gas.

Answer

The building of more bicycle lanes in the streets.

Answer

Successful advertisement by several car manufacturers.

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