A millionaire is an individual whose net worth or wealth is equal to or exceeds one million units of currency. Depending on the currency, a certain level of prestige is associated with being a millionaire, which makes that amount of wealth a goal for some and almost unattainable for others. In countries that use the short scale number naming system, a billionaire is someone who has at least a thousand times a million dollars, euros or the currency of the given country.
Many national currencies have, or have had at various times, a low unit value, in many cases due to past inflation. It is obviously much easier and less significant to be a millionaire in those currencies, thus a millionaire (in the local currency) in Hong Kong or Taiwan, for example, may be merely averagely wealthy, or perhaps less wealthy than average. A millionaire in Zimbabwe in 2007 could have been extremely poor. Because of this, the United States Dollar (USD) is the most widely used currency standard to compare the wealth of people all over the world. Hence a person must have a net worth of at least one million USD to be recognised as a millionaire anywhere in the world.
At the end of 2018, there were estimated to be just over 14 million millionaires or high-net-worth individual (HNWIs) in the world. The United States had the highest number of HNWIs (4,900,000) of any country, while New York City had the most HNWIs (377,000) among cities.
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