Drawn as graphs , they both made exponential curves , with their value increasing by multiples of two instead of by regular increments in a straight line .
他们绘出的图表皆为指数曲线，结果以二的指数倍在增加，而非是规则的线性增量。
The prevailing assumption in trade and location theory at that time was diminishing returns , which said that increments to productivity are the greatest when you start from low levels of output in a product .
