My main reaction to that graphical model is that it would be surprising if the intersection point was currently exactly on the cusp in the demand curve, unless there was something keeping it there. To the extent that that model works, I'd expect our current situation to have a shorter vertical bit on the demand curve (there are in fact people going hungry), so that the intersection is somewhere in the slopey bit, at lower price than your first picture. Then UBI could bring us to the second picture, where the price has risen, but food is still more widely available than the status quo. (This is one of the directions I was looking at.)
With competition, it seems to me that retailers currently have margins that competition could eat into, but doesn't. If one of the factors keeping margins above epsilon is the amount of money people are willing to spend, then an increase in that would presumably also increase margins.


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Think you have a finely callibrated and important information diet? Imagine if you had the world's strongest intelligence agency tailor the news for you. Well, you don't have to imagine, because the president's daily briefs have just been declassified. If you're interested, you can collaborate with researchers to get a better handle on it. Enjoy.
For convenience, here's a link to the individual briefs as separate PDF files, for anyone else who doesn't want to download all 34MB at once. (I thought the Flickr page might have a few convenient, face-on snapshots of pages from the briefs, but the CIA reckoned it was more important to take 5 photos of a woman wheeling a trolley of briefs through the CIA lobby. #thanksguys)
I suspect daily presidential briefings from the CIA are finely (as in carefully & deliberately) calibrated but not that well calibrated (as in being accurate, representative and not tendentious). The CIA doubtless has incentives to misrepresent some things to the president — and indeed a president probably has some incentives to allow/encourage being misled about certain things!