If you invest in the S&P 500 take a look at the largest weighted components. You will find that maybe you should care about Apples stock price. Below reference is slightly dated but still on point today
"S&P 500 components are weighted by free float market capitalization. Larger companies affect the value of the index to a greater degree.
For example, as of March 2015, the sum of the market capitalizations of the companies in the S&P 500 was $18.5 trillion. The largest member of the index was Apple at $720 billion. In contrast, the smallest member of the S&P 500 was Diamond Offshore Drilling, with a value of $3.65 billion.
Changes in Apple's stock price affect the overall index by almost 200 times more than Diamond Offshore Drilling. Due to its size, Apple makes up almost 4% of the index, while Diamond Offshore Drilling accounts for 0.02% of the index.
Read more: How are S&P 500 index components weighted? | Investopedia
How are S&P 500 index components weighted? | Investopedia
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