Using panel data for Peru for 1994-2000, the authors find that when households receive two, or more services jointly, the welfare increases as measured by changes in consumption are larger than when services are provided separately. The increases appear to be more than proportional, as F-tests...

The most effective regulators in developing countriesare following remarkably similar approaches. The main common element across"best practice"countries is the use of relatively simple quantitative models of operators'behavior and constraints to measure the impact of regulatory decisions on some...