For each of the following please illustrate the original and new budget constraints and then explain/show how each option is likely to affect the hours of work.

All doctors would be required to devote a percentage (for example, 10%) of their time "pro bono" to providing care for the poor (meaning they won't be paid for it).

Doctors must provide a certain number of hours of care (say 250 per year) for free to the poor

Doctors who earn over a certain amount (say over $250,000 per year) must donate $2,500 to a fund which will be used to provide care for the poor.