Despite witnessing the stock's massive rise over the last year, Chipotle Mexican Grill (NYSE:CMG) investors found a way to be pleasantly surprised by the company's latest quarterly results: Shares jumped after Chipotle announced a 21% boost in sales and a 29% profit improvement. But there was a lot more to this earnings report than just those headline numbers.

In the video below, Fool contributor Demitrios Kalogeropoulos highlights the biggest factor that helped the burrito slinger post record results last quarter. At 9.3%, Chipotle logged what will probably stand as the best comparable-sales performance of any national restaurant chain -- powered almost completely by increased customer traffic. Looking ahead, Demitrios argues that comps should continue to drive sales gains in 2014, but that Chipotle has room to finally raise its prices in line with food cost inflation, given that its customer traffic trends are so strong.