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From Wikipedia: "EU Member States would also pass on to Greece all profits which their central banks made by buying Greek bonds at a debased rate until 2020. Private investors accepted a slightly bigger haircut of 53.5% of the face value of Greek governmental bonds,[10] the equivalent to an overall loss of around 75%."
From the article: "The Federal Republic of Germany's creditors -- 20 countries including Greece -- indeed agreed at a London conference to write off 55 percent of the country's 32.3 billion Deutsche marks of foreign debt."
Another comment that phrased it well: https://news.ycombinator.com/item?id=9845165
And absolutely regardless of John Money being misguided and vilified (I don't think I even heard of him before recent Catholic backlash), gender is a legitimate and in depth academic topic.
As discussed above, funding for UBI can be mostly reassigned from existing welfare & pension budgets.
Demand for basic food and shelter is more or less a constant (unless you can argue otherwise), regardless of people's income, so as I see, prices for non-luxurious items could stay about the same under UBI.
It's a simplistic overview and there are tons of important factors e.g. farming subsidies or migrations, but in general UBI makes a lot of sense.