How has your week been? Something like this, probably. On Monday, you weighed up whether to take someone new on, how much of your pay survives the tax office, or whether you might get a rise this year. On Wednesday evening, a reel, or an item on the news, caught your eye: the election is coming and none of the candidates has much to say for themselves. On Friday, you went to a concert, argued with friends afterwards about how the band had played, then about the price of beer, and ended the night talking about migration.
Three unrelated situations, on the face of it. Yet, you felt no contradiction between them, because all three fitted comfortably inside one head over the course of a single week.
Now, look at how you were described on those same days by the people whose job it is to explain what happens in society.
On Monday, an economist was talking about you. To them you are a labor cost, a taxpayer, a consumer — someone whose behavior shifts when the incentives shift. On Wednesday, it was a political scientist or a sociologist, reading out poll results. To them you are a voter, sorted by age, address, income and education into a group that will probably vote one way rather than another. On Friday, a philosopher or a scholar of culture asked why the music you like is the music a society like ours finds worth liking. Values, meaning, taste.
None of these accounts is wrong. They are simply all about the same person.
We are not rational calculators in the office and the supermarket who then mislay our reason the moment we start talking about a band we love. Nor is a politician merely a creature seeking re-election: they are also an economic actor, with values of their own.
You will have heard one of them say something like this: “Too little of our GDP is redistributed through the budget. That is unfair.” The first half is a claim about the economy, and you can check it against the figures. The second half is a statement of an entirely different kind. What does “too little” mean? What makes it unfair? Those are not economic questions at all.
The same thing happens in ordinary decisions. A business owner may put off hiring, not because money is tight — the opposite may be true, with the business growing and the hire making obvious sense. They put it off because they do not know what the tax rules or employment law will look like after the election. The economics of the decision turn on the politics. And the decision is personal as well: giving someone a job means taking on a responsibility towards them. That is a value, and it can be the thing that settles the matter.
No single discipline, on its own, explains a choice like that.
Which is where philosophy comes in — though not from above. Economics needs politics, because economic decisions are taken inside a political environment. Political science needs economics, because political decisions have real economic consequences. Both need philosophy, because facts alone never answer the question of what we ought to do. And philosophy needs both: if we are discussing redistribution, we have to know which incentives it dulls and who pays for it; if we are discussing the state’s duty towards the poor, we have to understand what powers the state holds and how it uses them.
There is a further reason this matters. Scholars of social life find it hard to resist the ideal of the natural sciences: measure it, model it, forecast it, as precisely as possible. But a person is not an atom with a trajectory. People decide, interpret what is around them, and change their behavior according to what they value.
Specialization has bought us precision, and that is no small thing. A narrow view often catches what someone trying to take in everything will miss. But a doctor who set out to cure one organ without asking what the treatment would do to the rest of the body would cause more trouble than they cured. The difficulty begins when a specialist treats one aspect of a life as enough to explain the whole of it.
A person does not divide into disciplines. In the evening, over a drink, they may be a philosopher; in the morning an office worker; on polling day a voter. Not three different people — one person, acting.