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September 20, 2013  Fri 2:14 AM CT

SPX: SEE CHART GET CHAIN FIND STRATEGIES
Today's calendar of economic events is empty aside from Darden Restaurants' quarterly results.

Housing is the main theme next week, though the only item on Monday's agenda is the Chicago Federal Reserve's regional index.

Tuesday brings the Case-Shiller index of house prices and data on consumer confidence, along with earnings from homebuilders KB Home and Lennar.

Durable-goods orders and new home sales follow on Wednesday.

Thursday's docket includes the final revision of second-quarter gross domestic product, initial jobless claims, and pending home sales. Accenture and Nike report after the closing bell.
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The Movement of Delta

In our last column, we spoke about delta. You might remember that we discussed what delta was and what factors affected or changed delta. As you recall, we stated that three factors will have an effect on delta. They were movements of time, volatility, and underlying price. Today, we want to take a further look into the change of delta, this time focusing on change due to the movement in the underlying price. 

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