America's statisticians have known about this substitution bias since at least 1961, when a commission urged the development of a better index.

美国的数字统计学家至早从1961年就已经了解到这种方法的缺陷，当时委员会强烈要求采用更合理的测量方法。

A major idea in the UNCTAD report is its call for the development of a better world financial system with a more secure base.

UNCTAD报告的主要观点是呼吁开发拥有更坚实基础的更好的世界金融体系。