Conserve concessions; get something in exchange for each one

When Nixon was practicing law in the 1960s, he gave me this practical counsel concerning some negotiations in which O was involved:
1. Get something for every concession. Don’t think you have to give tit for tat. Don’t feel you have to split 50-50. If he gives 60, give him 40.
2. Make concessions that give nothing away.
3. Conserve your concessions.