Colombia, once a model of fiscal discipline for other Latin American nations, has seen its fiscal situation deteriorate since the early 1990s. Higher government spending, taxes that did not keep pace with expenditures, and severe recession led to an unsustainable debt-to-GDP ratio of 52 percent...

Volatility in commodity prices has been accompanied by perpetual renegotiation of contracts between private investors in natural resource production and the governments of states with mineral and energy wealth. When prices skyrocket, governments want a larger share of revenues, sometimes to the...