Another factor contributing to the tendency to deny the assumption of a fixed human nature was that the concept has so often been abused as a shield behind which the most inhuman acts are committed.
另一个促使人们倾向于否定本性难移假设的因素是，这一概念经常被滥用，被当作大多数不人道行为的挡箭牌。
3
But fixed supply will become a constraining factor on economic activity.