In a bizarre twist, the Mexican peso has held strong against the oil price surge, but only if you're willing to shell out 500 pesos for a 'No Hay Cambio' t-shirt. Local entrepreneurs are cashing in on the trend, selling t-shirts emblazoned with the phrase 'No Hay Cambio' - a tongue-in-cheek reference to the infamous phrase that translates to 'No Change' - to bemused tourists.