I'm confused.

Underwater Homeowners Cannot Explain the Weak Recovery by Dean Baker

The claim is the dropoff in consumption due to the debt burden of these homeowners explains the weakness of the recovery.

Some simple arithmetic shows the absurdity of this view. The amount of underwater equity is estimated at between $700 billion (Core Logic) and $1.1 trillion (Zilliow). Suppose that we can disappear this debt through some decree, how much additional consumption would we see? If we assume that these households spend an incredibly large share of this increase in their net wealth, say 15 cents on the dollar, this would imply additional consumption of between $105 billion (Core Logic estimate) and $165 billion a year (Zillow estimate).

However we would have also destroyed the wealth of the mortgage holders. Let's assume that they just spend 2 cents on the dollar of their wealth. This would imply a net boost to demand of $91 billion to $143 billion. While this would be a helpful boost to the economy, equivalent to a government stimulus program of this size, this would hardly be sufficent to make up a shortfall in annual output that the Congressional Budget Office puts at close to $1 trillion.

Calculated Risk:

Next Thursday, the BEA will release the second estimate of Q3 GDP. The consensus is GDP will be revised up to 2.8% annualized growth, from the advance estimate of 2.0%. This would be a pretty sharp upward revision.