Some are tied to commodities, which are getting snapped up as the global economy emerges from its long slumber. Lumber prices are at an all-time high thanks to an epic home-building boom. Copper and steel prices have also reached records. Agricultural products aren't exempt. The price of corn is at its highest level since 2012. Same goes for soybean prices. Even sales of block cheese futures have been soaring in anticipation of grilling season. Then there's consumer products. Diaper prices have gone up in the past year, and two major producers — Kimberly-Clark (KMB) and Procter & Gamble (PG) — have warned customers that fresh hikes are coming. Shortages of computer chips, meanwhile, are helping to push up car prices, and could soon do the same for electronics and household appliances.