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If gold's price implodes then what goes up?
It seems that you're interested in an asset which you can hold that would go up when the gold price went down. It seems like a good place to start would be an index fund, which invests in the general stock market. When the gold market falls, this would mainly affect gold mining companies. These do not make up a sizable portion of any index fund, which is invested broadly in the market. Unfortunately, in order to act on this, you would also have to believe that the stock market was a good investment.   To test this theory, I looked at an ETF index fund which tracks the S&P 500, and compared it to an ETF which invests in gold.  I found that the daily price movements of the stock market were positively correlated with the price of gold. This result was statistically significant.  The weekly price movements of the stock market were also correlated with the price of gold. This result was also statistically significant.  When the holding period was stretched to one month, there was still a positive relationship between the stock market's price moves and the price of gold. This result was not statistically significant.  When the holding period was stretched to one year, there was a negative relationship between the price changes in the stock market and the price of gold.  This result was not statistically significant, either.