The same way that the average earth temprature is the hottest on record beind 17.05 compared with 16.8. It may not seem a lot but we are talking total average from the -60c to the +55c around the globe.
The intrest rates are an average of all commodities and the percentage increase is per year. So if everything is up 3% from last year that means as a whole every year its compounding (adding up)
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