Prediction: Caterpillar's Stock Becomes a Buy When This Key Number Turns Around

Nobody said investing in equities was easy, and that observation certainly holds when examining the investment proposition at Caterpillar (CAT -1.25%) right now. There is a robust case for buying shares of the heavy machinery maker today, but there's one key thing investors will want to see before buying the stock.The case for buying Caterpillar stockDespite a 10% year-over-year decrease in sales in the first quarter and a whopping 27% decline in operating profit, there's still a robust case for buying Cate ...