How might having a large percentage of uninsured people negatively affect the entire country

Imagine that more than 60% of people are not insured and there is a major catastrophy in a certain area where people are not insured. Due to this, they will have to pay for their own bills and because they have to pay for their own bills, they can lose all their money. 

There is a cascade happening here because when a large group of people lose their money, this negatively affects the local economy and can slow the market down. 

This is a very complex problem that can negatively affect a very varied group of people and is hard to explain in a simple and short way :)

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Because you get to live without any hoses bothering u