In all seriousness, this would be a massive stimulus to the economy. Americans are consumers at heart. All the money saved on insurance and/or other healthcare related costs would then be spent elsewhere.

Cars, clothes, TVs, Labubu dolls. People will use the savings to buy things. In massive quantities.

There is also some indirect bonus: if people's healthcare is not tied to their employer then it's easier to look for a new one. Also if the system is done well, then many companies would lose the incentives they currently have for not giving full-time employment.

Some would, but some would just put that money into savings and investments instead.