为什么股票会涨会跌？

股票价格的涨跌是资本市场中最常见和最复杂的现象之一。股票价格的涨跌受到多种因素的影响，以下是其中一些主要因素：

首先，公司业绩是影响股票价格的重要因素之一。公司业绩包括公司的收入、利润、净资产等指标。当公司业绩良好时，公司的股票价格通常会上涨；相反，当公司业绩不佳时，股票价格则会下跌。英文翻译：

Why do stock prices rise and fall?

The rise and fall of stock prices is one of the most common and complex phenomena in the capital market. There are many factors that affect stock prices, including the following:

Firstly, company performance is one of the important factors affecting stock prices. Company performance includes indicators such as company revenue, profit, net assets, etc. When a company performs well, its stock price usually rises; conversely, when a company performs poorly, the stock price will fall.

其次，市场供求关系也是影响股票价格的因素之一。当市场上的投资者对某只股票的需求增加，而供应不足时，股票价格就会上涨；相反，当市场上的供应过剩，而需求不足时，股票价格就会下跌。英文翻译：

Secondly, market supply and demand is also a factor that affects stock prices. When the demand for a certain stock among investors in the market increases but the supply is insufficient, the stock price will rise; conversely, when the supply exceeds the demand in the market, the stock price will fall.

此外，宏观经济因素、政策法规、投资者情绪等也会对股票价格产生影响。这些因素相互作用，共同决定着股票价格的走势。英文翻译：

In addition, macroeconomic factors, policies and regulations, and investor sentiment can also affect stock prices. These factors interact with each other and jointly determine the trend of stock prices.