M&A deals are good for stock prices because the acquiring company typically pays a premium for the one it’s buying.

Falling interest rates also set off a rally in the bond market. Concerns about swings in stock prices prompted investors to switch money out of stocks and into bond funds. If investors decide that the bond rally may be nearing an end, that flow of funds may be reversed, providing a support for stocks.

“Equities are the best house in a bad neighborhood,” says Cantor’s Kessler. “Bonds are, not priced to euphoria, but they are definitely rich compared to equities right now.”

Not all investors are as sanguine about the prospects for 2013.

The rally in stocks in 2012 had less to do with company earnings and the economy and more to do with monetary stimulus from the Federal Reserve and other central banks around the world, says David Wright, a managing director and co-founder at Sierra Investment Management in Santa Monica, Calif.

Federal Reserve Chairman Ben Bernanke announced Sept. 13 that the central bank would add another round to its bond-purchase program, known as “quantitative easing” on Wall Street, which is intended to lower borrowing costs and boost growth. Speculation that more stimulus was coming had pushed the S&P 500 index to 1,466, its highest close of the year, a day earlier. The Dow peaked for the year at 13,610, Oct. 5.

“The Fed has done everything it can do and is probably pretty close to having used its last bullet,” said Wright. “It’s been a good year for stocks, but we think that’s an artifact of monetary stimulus.”

The 2012 peaks in the Dow and the S&P 500 won’t be surpassed in 2013 and stocks may even slump in the first quarter, as investors lower their earnings expectations, Wright says. The money manager also says that any budget plan, regardless of the details, will be negative for stocks as it will involve higher taxes and lower government spending.

Wells Fargo Securities market analyst Gina Martin Adams also says companies will struggle in the first half of the year as the economy flirts with recession. Export growth is slowing and policymakers are struggling to come up with a plan to reduce the budget deficit.

The bank recommends that investors add to their holdings of financial and utilities stocks because low rates should help support steady earnings growth in the early part of the 2013. Financial stocks advanced 25 percent in 2012, making them the best performing industry group in the S&P 500. Utility stocks fell 3.4 percent, the worst performing of 10 industry groups in the index. The bank says investors should reduce their exposure to so-called consumer discretionary stocks, such as hotels and restaurant companies, because consumer spending will likely take a hit next year as taxes rise.

With a backdrop of historically low interest rates and an economy that still needs to address its fiscal imbalances, investors should remain realistic about the returns they are going to get from the stock market, says Darell Krassnoff, managing director at Bel Air Investment Advisors.

“Things are getting better, not worse, but you have to have reasonable expectations,” Krassnoff says.