With the government shutdown nearing its one-week mark, investors may be monitoring how the stalemate in Washington is affecting their portfolios .

So far, stocks have been doing just fine. Although the S&P 500 was down slightly on Tuesday , the index returned 0.80% between Oct. 1 and Oct. 6 — and even notched several new highs .

It turns out that market gains during and following a government shutdown are not unusual.

"Historically, shutdowns themselves have rarely derailed equities," said Cathy Curtis, a certified financial planner and the founder and CEO of Curtis Financial Planning in Oakland, California. Curtis is also a member of CNBC's Financial Advisor Council .

Markets don't price in 'current noise'

The S&P 500 spiked 36% during the year after the last governme

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