An accident could be on its way. Silver coins are melted in order to be re-used again at the Mexican Mint, or Casa de Moneda, in San Luis Potosi, Mexico, on Thursday, Feb. 5, 2015. Companies in Mexico are on pace to sell the most peso-denominated debt in 14 years as they capitalize on a tumble in benchmark borrowing costs. (Bloomberg) — The stage is set for another financial crisis to unravel years of relative calm in debt markets. At least that’s how firms from UBS Group AG to Invesco Ltd. see it. Here’s why: Prices in the world’s biggest bond market are swinging and the plunge in oil is sinking the economies of nations from Venezuela to Nigeria. To top all that off, the fundamental structure of the bond market has changed in a way that makes it difficult for regulators to gauge exactly where risks are building. […]