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The LTSE is designed to remove the short-term pressures that plague today’s public markets and reorient companies and investors around long-term thinking.While it's certainly a popular belief... from my understanding it's not at all proven, or even obvious, that stock markets encourage short-term thinking over long-term.
Indeed, theory would suggest the contrary: the value of a stock is the discounted entire future cash flow, which means the stock market should be focused on the long-term more than anybody else.
While managers, on the other hand, may only be around for a few years, and one could argue they have every incentive to pump the price of the stock as high as it can go in the short term, to maximize the value of their options -- to the detriment of long-term value.
Anecdotes are easy to find on both sides. But ask yourself which is more likely -- that investors are dumb and managers are smart and investors should just trust managers to do the right thing? Or that investors are smart and need to hold managers accountable because it's the investors' own money at stake, while managers are smart too but always want a longer leash to do their own thing regardless of whether it's good for the company as a whole (e.g. spend more resources on cool side projects)?
E.g. see https://www.ft.com/content/23fd921e-3b75-11e5-bbd1-b37bc06f5...