Air Shangrila sells to both tourist and business travelers on its single route. Tourists always buy their tickets three weeks in advance, while business travelers never do. The weekly demand function of tourists is
QdT = 6,000 - 10P
And the weekly demand function of business travelers is
QdB = 1,000 - P
If the marginal cost of a ticket is $200, what prices should Air Shangrila set for its tourist ticket, which requires a three-week advance purchase, and its business ticket? If the government passes a law that says all tickets must come to the same amount, what price will Air Shangrila set? What would be the elasticities of demand for the two groups at that price?