on a deeper level, of course, the old woman has given more OF HERSELF in sharing the loaf of bread, simply because she has chosen to forgo/renounce a greater value to herself than Gates -- that is, she do without the portion of bread shared far less than Gates can do without a million dollars. her family might suffer for her gift; his will not.
as it happens, i don't need to "imagine" this old woman because i actually spend significant amounts of my time and money helping the Haitian people of Les Palmes, Morne a Chandelle, and Durissy. i know REAL versions of such women. my family financially supports 3 Haitian teachers, helped build several schools, and annually help supply over 4500 Haitian children with school stuff.