Dec 27 (Reuters) - Tesla Inc (TSLA.O) shares fell 11.4% on Tuesday following a Reuters report that Tesla was planning to run a reduced production schedule in January at its Shanghai plant sparked worries of a drop in demand in the world's biggest car market.The world's most valuable automaker's production cuts at the Shanghai plant come amid a rising number of COVID-19 infections in the country.Hayes also added that Tesla's stock was facing a "perfect storm" of high-interest rates, tax loss selling and share sales by some funds that hold a significant amount of Tesla stock.Tax loss selling is when an investor sells an asset at a capital loss to lower or eliminate the capital gain realized by other investments, for income tax purposes.Meanwhile, a Reuters analysis showed that prices of used Tesla cars were falling faster than those of other carmakers, weighing on demand for the company's new vehicles rolling off the assembly line."