In MINT, investors are taking more duration risk than GSY (0.98 yrs vs 0.24yrs, according to Morningstar) and getting paid appropriately for it (1.09% vs. 0.44% 12-month yield).
The microfinance industry is somewhere between 35 to 40 yrs old, and the founder of many of these institutions is at an age where he or she needs to think about succession planning.