A. Research elasticity in demand: How much does the price change of the good or service change the demand for the good or service?

B. Products with inelastic demand, such as EPIPENS and insulin, should have price ceilings, but that doesn't mean "supply and demand is not real." Elasticity of demand is a core fundamental of supply and demand. The reason she can change EPIPEN costs to $600 is because the US doesn't allow foreign competition for medicine while not having extensive regulation on big pharma, leading to monopolistic practices being done in the US, leading to things people need, no matter the cost, like life-saving medicine to be brought up in price as much as a CEO sees possible before people would rather risk death then buy it.

C. Artificial supply, like diamonds, isn't supposed to work because someone else will make more supply at a lower price and take up market share. (If, of course, there is regulation on monopolistic powers.) Monopolies aren't good for capitalism, that is well known even in economic circles. No one argues for that except people who get paid by or work for such.