Public expenditure can be classified on the basis of benefits they confer on different groups of people. Common benefits to all: Expenditures that confer common benefits on all the people. For example, expenditure on education, public health, transport, defence, law and order, general administration.
More than 4.5 million American lives are saved each year by a single, selfless act--donating blood. In fact, just one pint of blood can help save up to three lives. Although 60 percent of the U.S. population is eligible to donate blood, only 5 percent actually do. There are several reasons for the low turnout, says Ronald Sacher, MD, Hoxworth Blood Center director and professor of internal medicine and pathology, ranging from nasty weather to discouraging myths.
It takes about eight weeks to replace iron lost when you donate blood, according to America's Blood Centers. Since it takes time to build up iron stores, increasing your iron just on the morning of donation won't help as much as increasing your iron intake for several weeks before donating.