Shares of Yum China Holdings, Inc. (YUMC) plunged 6.33% on Monday, as U.S.-listed Chinese companies faced a broad sell-off amidst growing concerns over the effectiveness of China's recently announced economic stimulus measures.

The decline comes after a brief rally in Chinese stocks in late September and early October, fueled by hopes of a significant boost to the country's sluggish economic growth. However, the optimism has faded as investors grow impatient with the lack of concrete details and implementation from Beijing.

According to analysts, there is mounting uncertainty about whether the stimulus program, which includes measures such as tax cuts and increased infrastructure spending, will be sufficient to revive consumer spending and reignite growth in the world's second-largest economy. China's GDP growth has slowed in recent years, raising concerns that the average Chinese consumer may be reining in spending out of habit, a trend that could prove difficult to reverse.