The S&P 500 Turns 50

The benchmark stock index has amassed quite a few milestones in its half-century. Here are some highlights

Standard & Poor's is marking the 50th anniversary of its flagship equity index, the S&P 500, on Mar. 5. Since its inception in 1957, the S&P 500 has become synonymous with the health of the global economy, and has spawned the creation of numerous investable products, as evidenced by the $1.2 trillion directly invested in the index.

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