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> create much hard to capture value. This is pretty key. Imagine a train line that allows commuters to get to work. Trains are expensive to run, so the actual cost to get a commuter to work and back is £100. The commuters are paid (say) £150 a day, after tax. Is this train worth 2/3 of their post-tax income? Probably not, so they won't use it, and the company can't get workers if there's no other practical way to commute. Workers can take less good jobs near home, earn less, but take home more. Or even no job at all. However, a worker generates substantially more than their post-tax salary in value to the economy as a whole, so subsidy of the train fare creates value by getting them to work and generating that value, even though the train cannot actually turn a profit itself by charging the commuters out of their income. Even if you say "well the company should just pay more if they've made that value", not all that value manifests directly on the company's bottom line, it includes downstream value, as well as intangible things like worker skills that are more of an abstract societal benefit. In the same way, roads produce massively more value than people would be willing to pay individually: all the food deliveries in a week might be worth, at retail, about £4 billion, say. If those deliveries can't be made, what will be the cost? £4 billion? Or more because the whole country will become a much less effective economy when everyone is starving and looking for food? And the universal-delivery postal system. Healthcare, childcare, energy, etc etc. |
Regardless of the specific case here, businesses do a horrible job of accounting for the externalities of their decisions. This shows up in two ways:
1. Negative externalities - there is a large cost to society of my company doing this, but I'm not the one paying the cost. As a result I can still make money off of it so I will do it. Even though it is a net negative for society. Dumping toxic pollution into a river is a great example. You need an external force (government) to step in to ensure they account for that. Either through things like laws to make it illegal (and actual enforcement of those laws).
2. Positive externalities - there are larger benefits to society of performing the action, but the company itself doesn't get that value as a result they don't do the action. Subsidizing things like the US interstate project is a great example of this. Again markets fail to capture this so don't do it. Or if they do it's in a way that's a net negative for society and becomes a defacto tax on all economic activity making other useful businesses unprofitable. Again an example would be if all interstates were privatized and drivers were charged maximal rates. It would drastically reduce economic activity.
There are absolutely situations where markets are not the right solution to the situation and government intervention is, and they usually fall in where there are significant negative or positive externalities.