a- Why does an individual's demand curve have a negative slope? Explain. b- What factors cause a movement on the demand curve? Explain and use a demand diagram to illustrate your answer. c- What factors cause a shift in the demand curve? Just Name them. d- How does consumer behavior concerning an inferior good change if her income increases? Explain and use a demand diagram to illustrate your answer. e- How does an event like the current pandemic affect consumers' demand for mask? Explain and use a demand diagram to illustrate your answer. f- Does the development and availability of electric cars affect the price elasticity of demand for standard gas cars (cars with combustion engines)? Explain and use a demand diagram to illustrate your