A big justification for universal basic income is that if the real median wage had grown as much as productivity grew over this same period of time, all three lines would be near $50 per hour. UBI can be seen as a GDP dividend. Wages will never fairly distribute GDP growth. UBI can do it directly.
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https://www.scottsantens.com/how-money-is-born-out-of-public-spending-and-dies-by-taxes-mmt/
Here's how to understand the cost of UBI.
https://www.scottsantens.com/how-to-calculate-the-cost-of-universal-basic-income-ubi/
Inflation depends on a lot of variables. A poverty level UBI matched with appropriate taxing is doable.
https://www.scottsantens.com/would-unconditional-universal-basic-income-cause-inflation-ubi/