[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/images/03/13/art.lsummersspeech0313.gi.jpg caption="Larry Summers spoke at the Brookings Institution Friday."]
WASHINGTON (CNNMoney.com) - While touting the administration's economic plan on Friday, President Obama's top economic chief said it was unclear how long the fixes would take to work.
Larry Summers, director of Obama's National Economic Council, explained the administration's multi-pronged attack to stimulate the economy, help homeowners struggling to pay mortgages and relieve financial markets.
But Summers, speaking to a packed crowd at the think tank the Brookings Institution, also admitted that "no one can know just when and how its positive effects will be fully felt."
Summers did say that he saw some early signs that the economic crisis could be beginning to ease. He pointed to consumer spending, which collapsed during the holiday season but now appears to be stabilizing.