The price decreases.
If supply of a commodity decreases, the supply will fall. Prices and supply of good have positive relationship.
If demand decreases and supply is constant, the price will increase.
When demand decreases, supply increases.
prices go higher
It decreases cost of production and increases supply.
If the price decreases then the economic law of demand & supply comes in operation with increase in demand and decrease in supply, as the producer will not supply at the price unsuitable to them in the market .
As demand increases, supply increases, and as demand decreases, supply decreases. (Assuming Ceteris Paribus (All other factors are held constant))
Decreases the money supply
I assume you mean micro-economic situations, hence not aggregate supply. Generally demand will increase as supply decreases, and vice versa, but how much depends on the elasticity of demand. This is because as supply decreases, price level decreases also, so more people will demand the good or service.
Lower Taxes
Price increses