He released the iPad knowing there was a high demand for digital reading devices.

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The rise in demand for put options on the stock helped lift the overall reading of options implied volatility on Analog 4.5% to 29.18%.

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New orders, a proxy for global demand for Chinese goods, reversed a 48.3-contraction reading from August, jumping to 50.9 in September.

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While distributing pricey e-reading devices isn't much of a threat to Gideons, it's likely that the proliferation of e-reading features on all mobile devices could make a dent in demand.

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The rise in demand for ODP call options helped drive a 50.4% rise in the overall reading of options implied volatility on the stock to 84.96% this afternoon.

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Increased investor demand for put options on the fund fueled a 7.8% increase in the overall reading of options implied volatility on the IYT to 20.72%.

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It allows us to get a reading on the level of buying or selling interest and can help to determine whether supply or demand is dominating a market.

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