A last-minute enrollment surge enabled the White House to meet its 7 million sign-up target for the Affordable Care Act. President Barack Obama said on Tuesday that 7.1 million people had signed up on federal or state exchanges for coverage under the healthcare law. 

a. If the White House target was to enroll the efficient quantity of families in Obamacare, how would it have determined that target?

b. Draw a graph to illustrate the health insurance market and illustrate how the Obamacare subsidy influences the number of families covered.

c. How would the demand for health insurance change if the penalty for not signing up for Obama care were abolished? Draw a graph to illustrate the outcome