Yeah, I know why people _want to_ (betting), but it doesn't serve a broader economic purpose.
It’s all betting.
If someone wants to dress it up in jargon or talk about beneficial second order effects, they can. But if putting money on an outcome you can’t control isn’t gambling, I don’t know what is.
You’re not going to make up a silly low number because you actually have to buy the bananas yourself at some point, and you help price discovery because now that guy isn’t buying bananas at a higher price than someone is willing to sell them for.
What I'm getting at is when does it go from investing, "I think this entity is going to take my money and use it to build a profitable factory that will then return to me a share of the profits", to just gambling "I think this stock price will change by the end of the day and I'm going to bet on it", and what are the positives and negatives of that?
The distinction between investing vs gambling and positives and negatives sounds like more the subject of a PhD thesis than an HN comment! At some point the marginal benefit of smaller price spreads from very short term trade to actually allocating physical capital and labour to producing more valuable stuff might actually be lower than the amount it simply inflates asset prices, but that is much closer to microseconds than "you're not allowed to bet against this IPO, the insiders artificially pumping its value need to be able to cash out first"...
Producers that use commodity futures to lock in a sale price need a buyer or speculator to take the other side of the transaction.
Plus there's option traders who naturally need to go short sometimes.
Lots of replies either personally benefit or just assume the "way things are" is the best, but the stock market has gotten highly abstracted from the original intention of providing capital to grow companies via means other than bank loans.
I get the argument that shorts and friends help make the price the stock is being sold at more accurate, and I believe there's some truth there, but also we constantly see stock prices fluctuate by 10+% in a single day and I have trouble believing the actual value of all these companies changed that much in a single 24 period.
None of us have that crystal ball, so market participants try to guess at the future. It's not difficult to believe that those guesses can swing a lot in a single day. Just trying to figure out whether or the Hormuz will be open next week can give you whiplash.
its a reasonable expectation that 3 months after an IPO the price will be lower than it was at IPO
not really a bet so much as that on average the prices at IPO are a local maxima
(under the assumption your broker is managing their risk if your losses from a short position potentially exceeds capital available for liquidation if the trade moves against you)
Elon Musk is politicized so you're going to have people wanting to short against him, for reasons other than it being seen as a rational and sound investment strategy. This is one reason brokers tend to restrict this activity to certain types of investors who are more able to appreciate the risks, to say nothing of baseline necessities like needing a margin account to cover potential losses. Shorting is just very different than buying a stock.