Supply and demand, like Wile E. Coyote and Road Runner, follow each other often, work together closely, and are seemingly lost without one another. Play catch-up while you eat up with today's Groupon: for $10, you get $20 worth of American fare and drink at The Sports eXchange in Fort Collins.

Fluctuating prices, rising and falling according to customer demand, give The Sport eXchange's menu a Wall Street twist. The stock-exchange-themed eatery displays current rates on ticker tapes and reader boards throughout the dining room, enabling guests to time their orders to get the most sustenance for their Sacagawea. Slap a Hamilton on one of the ambrosial appetizers such as the sweet-potato fries ($4), fried pickles ($5), or quesadillas ($5), or upgrade to the 100% beef Fo-Co frank kept warm by a sheath of bacon, onions, bell peppers, and sriracha mayo ($7). Reel in the catfish po' boy swimming with cucumber rémoulade, lettuce, and tomatoes atop a baguette ($9), or couple a delectable dish with the chicken-tortilla soup, a mouthwatering mélange of poultry, corn, black beans, chili peppers, spices, cheese, and triangular tortilla chips that prove all equilateral shapes are created equal and, when salted properly, delicious.