Into public infrastructure.

For instance, there's a proposal in Britbong at the moment to roll back the green belt around certain cities which aren't London. On top of this, apparently each city would need a subsidy of around £50m to cover infrastructure costs of growing development.

Why not just allow companies to make tax-deductible investments in such infrastructure?

Because liberals don't want to beg to those they despise and rich people think it's hilarious the government goes after them but needs their help when they fuck up