GDP: The Ultimate Checksum.

<p>This morning we'll receive our first look at the Third Quarter's Gross Domestic Product. The ultimate MACRO Number, the sum total of the economy's goods and services.</p> <p>It's also the final checksum, making sure that what we've seen so far in the economy really adds up. Now a checksum is a block of data, used to make sure that your big database does not have any errors. </p>