Using a secretive arbitration system, multinational companies could bankrupt Honduras, one of the poorest countries in the world. A recent advisory opinion from a human-rights court calls for an overhaul.By Nicholas Kusnetz, Katie SurmaHonduras is one of the poorest countries in the Western Hemisphere. But that vulnerability has not stopped foreign companies from filing a wave of legal claims against the small nation that collectively seek roughly $20 billion, according to a new analysis by advocacy groups, a figure equal to more than five times Honduras’ public expenditures last year.