Market Extra: This is how bad the health-care stock selloff looks on charts—Is that a good thing?

If there are any investors still wondering how vicious the selloff in health care stocks has been over the past couple of weeks, the charts below are worth 1,000 words.

But there is a silver lining: Sometimes a sector or stock can perform so badly, that it can be a good thing.

The SPDR Health Care Select Sector exchange-traded fund XLV, +0.15% fell 0.1% in afternoon trade Thursday, reversing earlier gains of as much as 0.8%, to put it on track to close at a 3 1/2-month low. The ETF (XLV) has lost 0.9% year to date, making it the only SPDR ETF tracking the S&P 500’s 11 sectors to be down this year, amid increased political rhetoric regarding “Medicare for All” plans and lower drug prices.

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