BEIJING — Stock market and currency turmoil has battered Chinese leaders’ reputation as shrewd economic managers and fed doubts about their willingness to push through more wrenching reforms.

In the stock market, a “circuit breaker” to suspend trading in the event of wide price swings backfired and fueled steeper falls. It was withdrawn after just four days. That followed complaints curbs on stock sales and other emergency measures imposed to stop last year’s market plunge were clumsy and fueled investor panic.

In currency markets, Beijing has struggled to squelch expectations it plans to devalue the yuan. That has forced the government to spend tens of billions of dollars to defend the exchange rate.

Such volatility is common in developing countries, but China’s status as the world’s second-largest economy and biggest trader means missteps cause global shock waves. And the latest turmoil has a political tinge because it comes as Beijing is promoting a bigger role for itself as a regional military power and in managing international trade and finance.

The Communist Party under President Xi Jinping wants the prosperity that comes from free-market competition and has promised entrepreneurs a bigger role in the state-dominated economy. But when stock prices plunged last June, the party reached back to the era of central planning for the sledgehammer of direct government control. It banned sales by large shareholders and ordered state companies to buy.

Forecasters who expect China to keep growing at a healthy rate “pinned that expectation on a belief that market forces will be given greater play,” said Mark Williams, chief Asia economist for Capital Economics. “If the government cannot bring itself to allow market forces to be felt in China, then the outlook is a lot grimmer.”

Last year’s economic growth, due to be reported next week, is forecast to have slowed to 7 percent or below.