Remy is a New Orleans native who has lived for the past seven years in Boston. For each of the last seven years, he has made trips back to New Orleans for Mardi Gras, Jazz Fest, and Halloween. During 2018, the price of a round-trip ticket from Boston to New Orleans decreased from $575 to $350. As a result, Remy decided to buy new Mardi Gras and Halloween costumes that year and also decided to purchase tickets to see Big Freedia perform at the Brighton Music Hall in Boston.

a. Explain how Remy’s demand for costumes and concert tickets can be affected by a decrease in air travel prices.

b. By using this example, explain why both income and substitution effects might be expected to increase Remy’s number of trips to New Orleans.