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Notes: MPP keeps increasing until it reaches its maximum.
Up until this point every additional unit has been adding more value to the total product than the previous one.
From this point onwards, every additional unit adds less to the total product compared to the previous one – MPP is decreasing.
But the average product is still increasing till MPP touches APP.
At this point, an additional unit is adding the same value as the average product.
From this point onwards, APP starts to reduce because every additional unit is adding less to APP than the average product.
But the total product is still increasing because every additional unit is still contributing positively.
Therefore, during this period, both, the average as well as marginal products, are decreasing, but the total product is still increasing.
Finally we reach a point when MPP crosses the x-axis.
At this point every additional unit starts to diminish the product of previous units, possibly by getting into their way.
Therefore the total product starts to decrease at this point.
This is point A on the total product curve.
( Courtesy: Dr. Shehzad Inayat Ali ).

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