Wherever the elected officials want to. Generally it is a big hammer and is applied to sectors, so there is an expectation of low success rates. That is why the government is doing it, and not private investors. This time they supported the "green" technology sector through allowing companies to apply for low interest loans, and giving consumers tax credits for those items. The next elected administration / congress might try to encourage the airline industry with fewer fuel taxes, the clothing industry with import tariffs, or support USPS by taxing the internet. You never quite know what they might do, you just hope they don't do it for very long.

In the right place.

EDIT: HN really can't take a joke. Sigh