【中文版】

乘数是指一个数与另一个数的乘积，即两个数相乘的结果。在数学中，乘数通常用字母m表示，被乘数用字母n表示，积用字母product表示，即product=m×n。

乘数是指一个数量的增加，是指在一个数量的基础上再增加一定倍数的数值。例如，如果一个数乘以2，那么这个数的数量就会增加两倍。如果一个数乘以3，那么这个数的数量就会增加三倍。以此类推，如果一个数乘以一个大于1的任意正整数，那么这个数的数量就会增加那个正整数的倍数。

在经济学中，乘数是一个非常重要的概念。它反映了投资或消费对经济增长的影响程度。例如，政府支出或企业投资可以产生乘数效应，即一单位的投资可以产生多倍的效益。这种效应可以促进经济增长和就业。因此，了解乘数的概念和作用对于制定经济政策非常重要。

【英文版】

A multiplier refers to the multiplication of one number by another, which is the result of two numbers multiplied together. In mathematics, the multiplier is usually represented by the letter m, the multiplicand is represented by the letter n, and the product is represented by the letter product, i.e., product = m × n.

A multiplier refers to an increase in quantity, which means adding a certain multiple of a quantity. For example, if a number is multiplied by 2, then the quantity of that number will increase by two times. If a number is multiplied by 3, then the quantity of that number will increase by three times. Similarly, if a number is multiplied by any positive integer greater than 1, then the quantity of that number will increase by that positive integer's multiple.

In economics, the multiplier is a very important concept. It reflects the impact of investment or consumption on economic growth. For example, government expenditure or corporate investment can have a multiplier effect, which means that one unit of investment can produce multiple benefits. This effect can promote economic growth and employment. Therefore, understanding the concept and role of multipliers is very important for formulating economic policies.