“…Consequently, the provider is not entitled to withdraw from a sale even if the customer pays nothing (i.e., a price of zero) or an amount that falls below a minimal threshold value of the seller (unknown to the customer) as in the case of the "Name-Your-Own-Price" procedure (Fay, 2004). The English-speaking literature also uses the terms "Pay What You Think It Is Worth" (El Harbi et al, 2014), "Pay What You Believe Is Fair" (Sleesman & Conlon, 2016), "Pay As You Wish" (Bertini & Koenigsberg, 2014), "Pay What You Like" (Fernandez & Nahata, 2009), "Pay What You Can" (Saccardo et al, 2015) and "Pick Your Own Price" (Bourreau et al, 2015) as synonyms for the PWYW pricing method.…”