A million dollars ain't what it used to be.
More than four out of 10 American millionaires say they do not feel rich. Indeed many would need to have at least $US7.5 million ($7.4 million) in order to feel they were truly rich, according to a Fidelity Investments survey.
About 42 per cent of the more than 1000 millionaires surveyed by Fidelity said they did not feel wealthy.
Respondents had at least $US1 million in investable assets, excluding any real estate or retirement accounts.
"Every person in the survey is wealthy," said Sanjiv Mirchandani, president of National Financial, a unit of Fidelity. "But they are still worried about outliving their assets."
The average age of respondents was 56 with a mean of $US3.5 million of investable assets. The threshold for "rich" rose with age.
"They compare themselves to their peer group ... and they are also thinking about the long period they will have in retirement and want more assets [to fund their lifestyle]," said Michael Durbin, president of Fidelity Institutional Wealth Services.
Still, millionaires are slightly more optimistic now than they were in 2009, when 46 per cent did not feel wealthy.
Respondents were also more optimistic about the US economy. While they thought the current US economy remained very weak, they thought it would improve by the end of this year.
Fidelity noted the wealthiest 5 per cent of Americans held more than 55 per cent of the nation's wealth.