Income method measures National Income from the side of payments made to the primary factor of production for their productive services in an accounting year.

The components of factor income are (i) Employee’s Compensation, (ii) Profit, (iii) Rent, (iv) Interest, (v) Mixed income and (vi) Royalty.

Profit, rent, interest and other mixed income are jointly known as operating surplus.

1. Nyctalopia (night blindness) is caused by deficiency of Vitamin A.

2. Foods rich in Vitamin A are carrots, spinach, sweet potatoes, lettuce, etc.

3. Vitamin A deficiency can cause damage to rod cells, which reduces the ability to see in low light.