Thus far, we have discussed seat allocation under the assumption that there is a single price for seats, but most flights and entertainment venues have multiple seating tiers with different prices. For this exercise, assume we now wish to optimize price for both economy and premium economy seats, the latter of which are more expensive because they offer more leg room. Describe in words (no equations needed) how we can take the approach we have discussed thus far, and adapt it to a situation with both economy and premium economy seats