The below mentioned article provides a short note on ridge lines. This will also help you to draw the diagram of ridge lines. The marginal product of a particular factor may be negative if the quantity used is too large. For example, if too much labour is used there may be congestion and the efficiency of all the labourers may [...]
The below mentioned article provides a note on super-multiplier. The term 'super-multiplier' was first coined by J.R. Hicks in his business cycle theory. The object was to show the relationship between change in induced investment and the corresponding change in income. To be more specific, it indicates the ratio between the two changes, i.e., in investment and in equilibrium output. [...]
The below mentioned article provides a study note on the Engel function in economics. Engel's Laws: The relationship between total consumption expenditure and expenditure on a specific item at a point of time across the sample households is known as Engel Function or Engel Curve. The empirical results of the study undertaken by Engel [Ernst Engel was German Statistician] were [...]