 They use a Marxist analysis of capitalism but they argue that capitalism is overdetermined and that there are many non-capitalist economic practices that exist alongside it.Based on this insight, they elaborate a "politics of possibility" that explores alternatives to exploitative economic practices.As one reviewer notes, Gibson-Graham "rejects the idea that capitalist economies are tightly organized systems" and instead presents the economy as consisting of "many different undertakings, only some of which cluster around market transactions."