FintechFintech

A self-updating chronicle of U.S. markets — a century of the S&P 500, half a century of the Nasdaq, and 22 sector leaders, plus two home-grown timing signals: the K-Index and the LEAPS Window.一个自动更新的美股编年史——标普 500 的一个世纪、纳斯达克的半个世纪、22 个板块龙头，外加两个自制择时信号：K 指数与 LEAPS 窗口。