As the calendar turned to March, the market has wasted no time bidding stocks higher, with the S 500 and Nasdaq Composite both closing at all-time highs.

As of March 1, the S 500 is up 7.7% year-to-date (YTD), and the Nasdaq is up 8.4%. It's been a great run, but some fear that the market won't be able to keep up the pace.

At this stage in the rally, it is asking a lot from top leaders like Nvidia to continue carrying the market higher. With a 4.5% weighting in the S 500 and a year-to-date return of 66.2%, Nvidia alone has contributed a staggering three percentage points to the S 500's YTD return. Put another way, Nvidia is responsible for 39% of the S 500's YTD return.

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Source Fool.com