With the rapid descent of entry-level 3D printer prices, domestic adoption of additive manufacturing has accelerated. Desktop 3D printers require thermoplastic filaments, predominantly Polylactic Acid (PLA), to create physical objects. Economists tracking the consumer hardware sector have calculated that the cross elasticity of demand (XED) of PLA filament spools with respect to the price of 3D printers is -1.35.
Using the cross elasticity of demand value of -1.35, explain the relationship between desktop 3D printers and PLA filament spools.
