The way to set up this trade is to go long KO and sell short an equivalent $-amount of SPY shares.
Over time, I think that KO will start to outperform the market and this trade will make a profit. If they both go up, we need KO to do better than the market. If they both go down, again, we want to see KO do better and decline less than the market. The profit is in the difference between the performance and not the outright performance of KO .
Tim KO 40.96+0.30 (+0.74%) SPY 194.46+0.16 (+0.08%)