Marcia wants to sell lots of wrapping paper for her school’s…

Mаrciа wаnts tо sell lоts оf wrapping paper for her school’s annual fundraiser. She usually starts by convincing customers to order a single roll of wrapping paper. Once they agree to buy, she encourages them to order the 20-piece collection of wrapping paper instead. Marcia is utilizing the ____________ technique to increase sales.