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The pensions crisis is a predicted difficulty in paying for corporate, state, and federal pensions in the United States and Europe, due to a difference between pension obligations and the resources set aside to fund them. Shifting demographics are causing a lower ratio of workers per retiree; contributing factors include retirees living longer (increasing the relative number of retirees), and lower birth rates (decreasing the relative number of workers, especially relative to the Post-WW2 Baby Boom). There is significant debate regarding the magnitude and importance of the problem, as well as the solutions.〔(The Economist-Falling Short-April 2011 )〕 For example, , the estimates for the underfunding of the United States state pension programs range from $1 trillion using the discount rate of 8% to $3.23 trillion using U.S. Treasury bond yields as the discount rate.〔(Pew Center on the States-The Trillion Dollar Gap-February 2010 )〕〔http://rnm.simon.rochester.edu/research/JEP_Fall2009.pdf〕 The present value of unfunded obligations under Social Security as of August 2010 was approximately $5.4 trillion. In other words, this amount would have to be set aside today such that the principal and interest would cover the program's shortfall between tax revenues and payouts over the next 75 years.〔(2010 Social Security Trustees Report Tables VI.F1 and VI.F2 )〕 Some economists question the concept of funding, and, therefore underfunding. Storing funds by governments, in the form of fiat currencies, is the functional equivalent of storing a collection of their own IOUs. They will be equally inflationary to newly written ones when they do come to be used.〔 (Seven Deadly Innocent Frauds Of Economic Policy )〕 Reform ideas are in three primary categories: a) Addressing the worker-retiree ratio, via raising the retirement age, employment policy and immigration policy; b) Reducing obligations via shifting from defined benefit to defined contribution pension types and reducing future payment amounts (by, for example, adjusting the formula that determines the level of benefits); and c) Increasing resources to fund pensions via increasing contribution rates and raising taxes. == Background == The ratio of workers to pensioners (the "support ratio") is declining in much of the developed world. This is due to two demographic factors: increased life expectancy coupled with a fixed retirement age, and a decrease in the fertility rate. Increased life expectancy (with fixed retirement age) increases the number of retirees at any time, since individuals are retired for a longer fraction of their lives, while decreases in the fertility rate decrease the number of workers. In 1950, there were 7.2 people aged 20–64 for every person of 65 or over in the OECD countries. By 1980, the support ratio dropped to 5.1 and by 2010 it was 4.1. It is projected to reach just 2.1 by 2050. The average ratio for the EU was 3.5 in 2010 and is projected to reach 1.8 by 2050.〔(The Economist-Old Age Dependency Ratios-May 2009 )〕 Examples of support ratios for selected countries in 1970, 2010, and projected for 2050:〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pensions crisis」の詳細全文を読む スポンサード リンク
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