The current system also increases the importance of the 100-150 marginal seats where most campaigning is concentrated, and electoral reformers argue that it means the voters in the remaining 400 seats are regarded as irrelevant.

BBC: THE CLAIM

Supply sliders remind us of the importance of incentives, especially as they pertain to marginal tax rates.

FORBES: We Need Demand, Not Protectionism

As to importance, when originally identified as distinct, the archaea, too, were regarded as marginal yet their methane-generating properties are now a factor in climate-change calculations.

ECONOMIST: A new domain of life