two months of 2024 have passed, but the year has already been a pleasing one for stockmarket investors. The500 index of big American companies is up by 5%, having passed 5,000 for the first time ever, driven by a surge in enthusiasm for tech giants, such as Meta and Nvidia. On February 22nd Japan’s Nikkei 225 passed its own record, set in 1989.
Why stop there? Although the idea might sound absurd, the notion of ordinary investors levering up to buy assets is considered normal in the housing market. Some advocate a similar approach in the stockmarket. Ian Ayres and Barry Nalebuff, both at Yale University, have previously noted that young people stand to gain the most from the long-run compounding effect of capital growth, but have the least to invest.
Although that may sound like a long time, it is an unsatisfyingly thin amount of data for a young investor thinking about how to invest for the rest of their working life, a period of perhaps half a century. To address this problem, most investigations use rolling periods that overlap with one another in order to create hundreds or thousands of data points. But because they overlap, the data are not statistically independent, reducing their value if employed for forecasts.
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