NEW YORK (TheStreet) -- Halfway through 2015, and the Standard & Poor's 500 Index is up almost 3% at 2,120. Expect it to end the year between 2,150 and 2,250, said Paul Christopher, chief international strategist at Wells Fargo Advisors.

Why are stocks going higher in his opinion? Start with the economy and go on from there.

"Leading indicators look good to us six to 12 months out. How about earnings? We think the Street was too pessimistic in the first quarter. Our year-end target for S&P earnings is $128 per share. That's significantly higher than where we are right now," Christopher said. "Also breadth looks good. Twenty-one out of 27 sectors are up over the last year. That sort of breadth you don't find often."

And don't forget the Federal Reserve, which this week repeated its decision to postpone a rate hike despite a strong comeback in jobs and wages.

"You really have to give the Fed some credit here," Christopher said. "They have been very careful and very patient. We think interest rates move very gradually higher, and it won't bother the market going forward."

As to the best way to profit from the blue skies ahead, Christopher said stick to stocks that will most benefit from an economy that is not just recovering, but picking up a nice head of steam.

"That means we like growth over value. We like large-caps over small-caps. And we like those sectors that have the most leverage over the economy," Christopher said. "Think consumer discretionary, think information technology and industrials."

If you liked this article you might like

How to Get Rich Using Warren Buffett's Favorite Stock Market Indicators

How to Make Your Life Successful Just Like Billionaire Warren Buffett

With the Fed, It's Different This Time

China's Banks Halt Business With North Korea Per United Nations Sanctions

How to Live Just Like Billionaire Warren Buffett