15.
Which one of the following principles is employed in production when resources are scarce?

18.
The formula for rate of capital turnover is

19.
Development of farm sector gives a boost to secondary sector and development of primary and secondary sectors gives a boost to the tertiary sector. This is called the 'Product contribution of agriculture'. This concept was coined by

20.
In the linear relationship, each additional unit of the variable input when applied to fixed factor(s) produces

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