[00:01]A key selling point for investing in the stock market [00:06]is that over the long term, the risk of owning stocks decreases [00:13]and the odds of making money jumps. [00:17]But cracks in that Wall Street marketing message [00:21]became painfully visible in the just-ended 2000s [00:27]nicknamed the "Lost Decade." For the first time, [00:32]the Standard & Poor's 500-stock index finished a calendar decade [00:39]with a negative total return. [00:42]And that was even after the S&P rose 23.5% in 2009, its best gain since 2003. [00:56]Indeed, a $1 investment in the S&P 500 on Dec. 31, 1999, [01:06]was worth roughly 90 cents at the end of 2009 [01:13]and that negative return includes dividend income. [01:17]In contrast, investments viewed as harbors, [01:22]or more conservative places to park cash, [01:26]delivered positive returns in the 2000s. [01:31]A $1 investment in gold grew to nearly $4, [01:38]according to Strategas Research Partners. [01:42]And a buck invested in U.S. government bonds, [01:47]arguably the world's safest investment, grew to nearly $2. [01:54]The dismal showing by U.S. stocks raises a key question [02:00]on the first trading day of the 2010s: [02:05]Will the lost decade serve as a optimistic "launching platform" [02:11]for the new decade? Or will the negative move from two brutal bear markets [02:19]in the past 10 years and the economic damage caused by [02:24]the worst financial crisis [02:27]since the Great Depression set the stage for a second decade of [02:33]subpar performance for U.S. stocks? [02:37]In the past, stocks have did well [02:41]after 10-year periods in which they did poorly. [02:45]The S&P 500 has never suffered back-to-back losses in calendar decades. [02:54]In the 1930s, the last decade the index bled red ink, [03:00]it posted an annualized loss of 5.3%, excluding dividends, [03:07]and posted a little annual total return, [03:11]which includes dividends, of 1.0%, S&P says. [03:18]The good news: The index posted annualized total returns [03:23]of nearly 9% in the 1940s and 19% in the 1950s. [03:32]Similarly, an analysis of the 15 worst rolling 10-year periods [03:38]for the S&P 500 by The Leuthold Group found [03:44]that stocks posted positive returns in the next 10 years in all 15 cases. [03:53]The average annual gain: 10.7%, topping the 10% long-term average. [04:02]But not always. Japan's stock and real estate bubble [04:09]that burst in early 1990 set Japan up for not one lost decade but two. [04:18]The Nikkei stock average peaked on Dec. 29, 1989, at 38,915 [04:29]but remains more than 70% below its high despite big periodic rallies. [04:38]Steep drops wipe out excesses.Jeremy Siegel, a finance professor notes [04:46]that the nearly 20% annualized total returns posted [04:52]by the S&P 500 in the 1980s and 1990s were the best back-to-back decades ever. [05:02]The losses that followed in the 2000s were the market's way of [05:07]twisting out the joyment. [05:10]Shocks to investor sentiment are a positive contrarian sign. Jeff Kleintop, [05:18]chief market strategist at LPL Financial, [05:23]says stocks tend to get riskier when investor expectations [05:29]are super-optimistic. On the flip side, when sentiment gets depressed, [05:35]upside surprises are more likely.