I wonder whether short selling would be of any real value. In order to sell short, you have to borrow the asset from someone who owns it. If the government did that in any scale likely to have an effect, it would be immediately known. There are traders who are willing to “bet against the shorts” because they know that sooner or later the short seller has to buy in order to cover the short sales. Some join in the short sale orgy themselves, but some watch to see when the prices caused by the shorts are ridiculously low. Then they start buying and the short seller either has to short sell some more in order to keep downward pressure on the market, or it throws in the towel and buys in order to cover. That buying, if it’s on a large scale, causes prices to rise and the short seller can lose his…um, shorts…covering his sales, which makes the prices go right back up to where the market thinks the intrinsic value is, right or wrong.
I’m no financial guru, but I, myself did some of that back in 2009 when financials were so disfavored. I could see that short selling was far out of reason, and started buying. Eventually the short sellers bailed and had to buy, which caused the stocks to go up, up, up.
People would figure it out and likely skin the government out of a lot of money because the traders are better at what they do than bureaucrats are likely to be.