Note that the actual inflation is probably more than that. Wikipedia ("United States dollar" article) lists an inflation of 2.16%, as of October 2012.
This can best be solved by converting the percentage to a factor: 1% a year means that prices increase by a factor of 1.01 a year. In 10 years, that would be a factor of 1.0110, or 1.1046. Your dollar loses value by the same factor: 1 future dollar becomes the equivalent of 1 / 1.1046 = 0.905 current dollars. In other words, you lose about 9.5% of your purchasing powers.
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B. Efficiency
True.
there are two reasons. 1. A dollar today can earn interest so you will have more than a dollar in the future. 2. Inflation will reduce the purchasing power a dollar over time, so it's better to get the dollar today and spend it today because it won't buy as much stuff tomorrow.
because of the purchasing power of a particular country is increasing
Inflation destroys the purchasing power of a paper fiat currency such as the dollar. In practical terms this means that when inflation is high the same number of dollars today will buy a smaller amount of goods or services tomorrow.Decrease. Inflation is when more dollar bills are printed. When you have more of something, the value always decreases per each of the something.
Twenty dollars. $18.25 if you discount its purchasing power for inflation.
rose by 1 percent
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reflation
It loses purchasing power.
Follow this link to an inflation calculator provided by the Bureau of Labor Statistics, which will provide the current purchasing power of any dollar amount from any time in the past (since 1913): http://data.bls.gov/cgi-bin/cpicalc.pl
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Inflation was fairly flat in the United States during most of the 1800s. A dollar from almost any time during that century would be have the purchasing power of about 4 cents today.