If someone has gumption, they are able to think what it would be sensible to do in a particular situation, and they do it. Surely anyone with marketing gumption should be able to sell good books at any time of year
sound practical judgment; "I can't see the sense in doing it now"; "he hasn't got the sense God gave little green apples"; "fortunately she had the good sense to run away"
If someone has the gumption to do something, they are brave enough to do it. He suspected that deep down, she admired him for having the gumption to disagree with her. the ability and determination to decide what needs to be done and to do it (Perhaps from gome (13-19 centuries), from gaumr)