How can patents speed up the process of creative destruction? how can patents slow down the process of creative destruction? how do differences in manufacturing costs affect which industries would be most likely to be affected by the removal of patents?

Joe pays ann to mow his lawn and ann mows vanna's lawn by mistake. vanna peers out her window and sees ann mowing, yet says nothing to ann about her mistake since vanna needs to have her lawn mowed. when ann approaches vanna for payment, vanna refuses, arguing that she never asked ann to mow her lawn. under these circumstances, ann can recover payment from vanna under: