TI". |{a) Please explain hovI.r if the United States gives Covid-lQ vaccines for free to poor developing countries= that might result in benets for both the United States and for the developing countries. Is this an externalitv for the United States? You must give an explanation. {b} Are Covid 19 vaccines in the United States a public good? Assume that there is no shortage of vaccines in the US. and the vaccines are paid for either by the government or by health insurance. Please explain. {c} Arc Covid19 vaccines in India a public good? In India there is a shortage of vaccines, and the public 1:91;th paj'.r outofpocket for the vaccines. Please explain