The aggregate supply curve shifts to the left when supplies of labor increase wage rates increase technology improvement investment increases What type of slope does a supply curve have? zero O positive O negative none of the above Which one of the following would most likely cause the supply curve for televisions to shift to the left: a decrease in the wage rate earned by workers who produce televisions an increase in the price of televisions an improvement in the technology used in the production of televisions a tornado destroys the factory where the televisions are produced