This is direct and indirect exchange in a perfect laminate, discrete economies that operate almost without contact or mutual acknowledgement. When you ask why people give so generously to the community, the answer is various: God, church, community, caring. But usually the answer was “Kentucky....
doi:10.1016/S0007-1935(17)53385-0H. PlattLondonI.P. VivianLondonElsevier LtdBritish Veterinary Journal