House Money Effect

The tendency to take excessive risks with money or resources perceived as 'gains' or 'winnings' rather than 'earned' income—as if house money (casino profits) is less real than your own money. After a windfall (bonus, investment gain, unexpected revenue), people gamble more aggressively because losses feel less painful when they're 'giving back gains' rather than 'losing their own money.' The mechanism: mental accounting creates separate categories for earned and unearned money, and the loss aversion that normally constrains risk-taking is reduced for money in the 'gains' account.

When to use it

When recent gains are encouraging riskier behavior than usual; when windfall income is being treated as 'play money'; when investment gains are being reinvested at higher risk than the original investment criteria would allow; when mental accounting is creating different risk tolerances for different 'buckets' of identical money.

How it can help

Treat all money as equally real regardless of its source. A dollar gained through investment is worth exactly as much as a dollar earned through salary—and a dollar lost from either source is equally lost. The practice: when you experience a windfall (bonus, inheritance, investment gain), don't immediately change your risk profile. Pause. Make allocation decisions using the same criteria you'd apply to earned income. For organizations: unexpected revenue or budget surplus should be invested with the same discipline as hard-won revenue.