My understanding is that the donation arrangement only exists in more affluent parts of the world, where people are more likely to be able to donate. In poorer countries, the literature still carries a specific "contribution" amount (i.e., a price) just as it did in the USA before the donation arrangement started. Tom
"The truth was obscure, too profound and too pure; to live it you had to explode." ---Bob Dylan
"The truth was obscure, too profound and too pure; to live it you had to explode." ---Bob Dylan