(Stage of production)
the 1 starting point AP 0 was highest, at this stage, when adding factors modulate variable passive MP will increase. (AP > MP) apply to yield total (TP) increase at an increasing rate (Increase at Increasing)
.The 2 starting from highest to AP MP equals 0 this stage and MP AP will begin to decrease, but total output (TP) will continue to increase. The peak until the receding from the MP = 0
.The 3 starting MP was 0 or TP maximum. This stage when added to another variable factors will apply to yield the total (TP). Decreased passive and MP deficit.