Every little hurts
Every little helps when you're a Treasury searching for billions of pounds in savings.
But if you're a politician every little hurts as well.
So, why has the chancellor risked the charge that he's broken his promise to preserve child benefit in order to save just a billion pounds? Why introduce a change which hurts families with a wife who stays at home more than two who go out to work? Why risk alienating the very many people who the party regard as their own?
In part, because George Osborne needs the money. The promised reform of welfare is worth around a billion pounds. Meantime, behind the scenes here, ministers are still sweating and haggling over everything from huge cuts in defence to how much more graduates will have to pay for their university education.
In part, it was to back up the government's claim that it IS being tough but fair... And IS ready to hurt its own traditional supporters.
In part, because this all makes it politically easier for them to tackle a welfare state the chancellor calls financially unaffordable and morally indispensability.
Already some here are counting the cost. Many many more will be doing that in the weeks to come.