Retired hedge fund manager David Rocker is betting against Tesla’s long-term prospects. He explains why in a Barron’s column.

Those who think today’s stock market is unlike that of 2000, when baseless enthusiasm pushed stocks up to wild valuations, only to collapse in subsequent years, should take another look. Do they remember counting eyeballs as a basis for value? Once again, history and reality are replaced by dreams with little substance. Tesla, in which I have a short position, is becoming the loudest canary in Wall Street’s coal mine.

Tesla requires repetitive capital raises to fund persistent operating losses. This requires bullish analysts and holders to keep the stock aloft with projections of imagined earnings from future products, while they overlook existing businesses, which continue to lose vast sums of money. …

… Raising the target price while more than doubling the company’s projected loss indicates the craziness of the times. Price targets are fantasies, discounting distant earnings estimates by analysts who show little accuracy in estimating only a year ahead.

FOR MOST COMPANIES, profit is the major objective. Tesla is different because its founder is different. Elon Musk is driven by a mission to replace fossil fuels with renewable energy. Unlike companies seeking profit maximization by using patents to establish exclusive rights to products, Musk encourages competitors and has made virtually all of his patents available. Almost all auto companies have imminent plans to compete.

Tesla has been first-to-market in electric cars, but this in no way guarantees success, as competition and technological change are major challenges. Remember Atari, Blackberry, AOL, Napster, Netscape, and Palm?

Musk is smart and imaginative, but none of his major companies are profitable. Tesla has been around for 14 years and has cumulatively lost more than $3.7 billion, despite the massive subsidies that it and its customers have received. SolarCity, also a beneficiary of alternative-energy subsidies, lost hundreds of millions of dollars before being bailed out by Tesla. As subsidies diminish, and competition emerges, profits will be even more elusive.