The problem with this approach is that each country has a different median income, so the definition of what is middle class shifts from place to place.

ECONOMIST: It��s a matter of definition

At another point Sandberg touched on a third institutional problem she believes needs attention, affordable child care, noting that the median child care cost for two kids is more than the median rent for most families.

FORBES: The Two Things Sheryl Sandberg Says She Would Do To Make Things Better For Women