Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
Librería Perelló (Valencia)
Librería Elías (Asturias)
Donde los libros
Librería Kolima (Madrid)
Librería Proteo (Málaga)
How do we find the TRUE CAUSE of what happens? When Momo drinks a special smoothie and wonders, 'but how do we REALLY know if it makes me jump higher?', she and her twin Puri discover the economist’s secret: comparing 'what is' with 'what would have been.' Playground adventures that teach the same tools economists use to find answers. Prepare for 'aha!' moments at any age!Building tomorrow’s problem-solvers, one story at a time.This is Volume 1 of the Impact Evaluation Series for Children and a brief introduction to the concept of Counterfactuals in Research Design and Methodology.