that might not typically be purchased on its own. We isolate the value of these perfectly-
complementary, auxiliary goods by endowing consumers with the complete good and giving
them the opportunity to pay to upgrade the auxiliary component of the good. We employ a
Becker-Degroot-Marschack auction design in a market setting to determine consumers'
actual willingness to pay for the auxiliary good. We find consumers are willing to pay a $0.67 …