Naroff said he thinks growth in the fourth quarter can reach a 2.6 percent annual rate. He said he expects growth to hit a rate of around 3.2 percent in the January-March quarter and 3.6 percent in the April-June quarter.
He said those estimates are based on his confidence that Washington policymakers will avert the sharp tax increases and spending cuts, which could trigger a recession if they remain in place for much of 2013.
Naroff said U.S. economic growth would benefit next year from a rebounding housing market, gradual hiring gains that will boost incomes and the likelihood that Europe's financial crisis will ease and dampen U.S. exports less than in 2012.
But he said his optimistic forecasts would be derailed if the economy goes off the fiscal cliff in January, which could send shockwaves through financial markets.
"If the fiscal cliff is breached, the biggest concern is confidence," Naroff said. "I remain hopeful that saner heads will prevail in Washington."
Economists said the budget impasse and the uncertainty it's created about tax rates are reducing consumer confidence. The University of Michigan said Friday that its index of consumer sentiment for December fell to 72.9, its lowest point since July. It was a sharp drop from the November reading of 82.7, a five-year high.
Chris G. Christopher Jr., senior economist at IHS Global Insight, said he still expected holiday retail sales to increase a respectable 3.9 percent this year over last year despite slumping consumer confidence. And he said spending momentum should continue into 2013 — as long as the fiscal cliff is resolved in a way that avoids damaging the economy.
"We are assuming that the fiscal cliff does get resolved, and if it does, we should see strong consumer spending and momentum for the economy in 2013," Christopher said. "But if we go down the fiscal cliff, then the first quarter will not be pretty."