Att lindra fattigdom är mer gissningar än vetenskap, och brist på data över biståndets effekter leder till frågor om hur det ska utformas. Men Clark Medal-vinnaren Esther Duflo säger att det är möjligt att veta vilka biståndsprojekt som gör nytta och vilka som inte gör det — genom att testa olika lösningar med randomiserade försök.
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