Prior to the Affordable Care Act, many privately-purchased non-group health insurance plans had stringent preexisting condition exclusions, which denied coverage to insured persons for any health conditions that already existed at the time of enrollment. (a) How did these preexisting condition exclusions arise from a market failure in the insurance market? (b) How did the ACA change the treatment of preexisting conditions in the private-purchase non-group health insurance market? What provision of the ACA made the preexisting condition clause less necessary? Explain. The End.