How China's Slowdown Will Hit the U.S.

NEW YORK (TheStreet) -- Slower economic growth for China will make U.S. companies less competitive, fund managers warned, as concern on the outlook for the world's second-largest economy rattles markets.

This is expected to cap gains for U.S. equities in 2014, with many investors questioning when the five-year bull run will come to an end.

A stream of disappointing economic data from China so far this year makes it unlikely the nation will hit its 7.5% GDP target in the first half, though a stimulus package or monetary easing is anticipated to boost growth in the latter part of the year. From a fiscal perspective, Chinese Premier Li recently noted that further Chinese defaults were inevitable, sparking fears of worsening balance sheet issues.

WATCH: China's Slowdown: Longer Term Investment Opportunity Remains

ING U.S. Investment Management's head of international equities, Martin Jansen, described the investment that developed nations have sunk into China as "massive", citing U.S. multinationals such as General Motors (GM) and Caterpillar (CAT). China is estimated to be a $300 billion market for U.S. firms, with General Motors selling more cars there each year than in the U.S. since 2010. Boeing (BA)has also predicted that over the next 20 years to 2032 China will buy 5,580 new commercial airplanes with a total value of $780 billion and be its largest commercial client outside the U.S.

For investors with a longer-term view, sitting tight may be a wise strategy. But in the short- to medium-term, "investors may want to trim stocks when exposure (to China) is excessive and if a stock is richly valued," Jansen said in a phone interview. He advised against indiscriminate selling of companies exposed to China, noting the impact of slower economic growth would be far more muted for U.S. stocks than those with direct investments.

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