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How to calculate cash loss over time?
There are two things you need to keep in mind when you look at Inflation as an entity. Inflation is necessary to keep in check the value of goods. As per Moore's Law for example, a mobile phone that you buy for £100 today will be available for £50 in two years. With increased purchasing power, one needs to maintain balance between the purchasing power and its value. If you think about the 'loss' at a rate of 2% you would have £96.04 (in terms of today's value) in two years. But if you looked at the same cell phone as leverage for your business where it allowed you to do work and earn £1000 in two years - the investment would clearly offset the cost of inflation. Inflation is incentive for people to spend their money. If you for example spent all of your £100 today, it is £100 income for someone else. He has further incentive to spend it creating a chain of transactions. In theory while this is a true mathematical loss, the increasing purchasing power helps you leverage your financial asset to get a return on your investment.