The below table shows the quantity demanded of footballs and volleyballs at a local sports store for different combinations of prices of the 2 goods: Price of Price of Quantity Demanded Quantity Demanded Football Volleyballs of Footballs of Volleyballs 520 $15 27 51 520 $20 29 42 $25 $15 18 57 525 $20 18 53 When volleyballs are priced at $15, the cross-price elasticity of volleyballs with respect to footballs is | 5 which implies that volleyballs are a substitute (complement or substitute) for footballs