If one uses this definition, there are an estimated 369 million people in the developing G20 economies who qualify as "middle class."However;
There's a better way to measure the middle class. Cars are big-ticket items that indicate the ability and willingness to purchase many other nonessential goods. Indeed, while the vast majority of households own a car in advanced countries and many own more than one, in developing countries owning a car symbolises relative affluence. Critics may contend that measuring car ownership excludes households that can afford, say, a computer, TV set, or air-conditioner, but not a car. However, because cars in circulation in the developing world are often of very old vintage and correspondingly cheaper -- for example, the average passenger car in India is 20 years old, compared with 11 years in the US – this supposed omission is not nearly as large as it seems.