Depends on what you're comparing it to. This thread is about unconditional cash. Giving everyone $1000 a month, unconditionally, is clearly many times more expensive than subsidizing the minimum wage by $1 an hour - it's rather difficult to work 1000 hours when a month has ~730 hours!

The "investment" (assuming that's what you mean by the math) can be as high or as low as any other proposal, there's nothing special about it. You can adjust the $/hr that you subsidize and the size of the group that is eligible to fit the proposed investment.