This note was prepared by Elena Ianchovichina (PRMED) and Susanna Lundstrom (PRMED) with input from Leonardo Garrido (PRMED). The note was requested by donors supporting the Diagnostic Facility for Shared Growth. We thank Carlos Braga, Vandana Chandra, Edgardo Favaro, Loga Gnanasambanthan, Harry Hagan, Fernando Hernandez, Eduardo Ley, Lili Liu, Elina Scheja, and Juan Pedro Schmid for their useful comments on earlier drafts.