✔ 最佳答案
you have to look at what change in the market. For example,
A increase in:
Price of a substitute will shift the demand right
Price of a complement will shift demand left
expected future price- D right
Income for normal good- D right
Income for inferior good- D left
Population- D right
Preferences- D right
If to look at the supply curve, an increase in:
Price of productive resources- S shifts left
Price of substitute of production- S shifts left
Price of complement of production- S shifts right
expected future prices- S shift left
number of suppliers- S shifts right
technology- S shifts right