Never invest in any scheme that is based on a metaphor, or anything with the word, “next”, in it (e.g., “this kid is the next Elvis Presley”, “this will be the Lake Lucerne of the Southwest”). You will lose your shirt.

What imperialists actually wanted was expansion of political power without the foundation of the body politic. Imperialist expansion had been touched off by a curious kind of economic crisis, the overproduction of capital and the emergence of "superfluous" money, the result of oversaving, which could no longer find productive investment within national borders. For the first time, investment of power did not pave the way for investment of money, since uncontrollable investments in distant countries threatened to transform large strata of society into gamblers, to change the whole capitalist economy from a system of production to a system of financial speculation, and to replace the profits of production with profits in commissions. The decade immediately before the imperialist era, the seventies of the last century, witnessed an unparalleled increase in swindles, financial scandals, and gambling in the stock market.

Such a 'flu shot' is now widely expected and would be unlikely to unsettle investors beyond a transitory period.

Models work when they are appropriate for the particular circumstance, but some of the best investment judgments over time have come when people recognized that models derived in other periods were broken or not directly relevant.

He who feels pain when paying off debts is not fit to leverage on debts as an investment strategy

There is no "ROI" without the "I."