Indexing UBI to a revenue stream is a bad idea because the revenue will tend to swing up and down in sync with economic cycles, making bubbles frothier and recessions worse. Constant spending by contrast acts more like an automatic stabilizer. <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Automatic_stabilizer" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Automatic_stabilizer</a>