Assignment 1 Semester 1 2026
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Due Date: 12 March 2026
QUESTION 1
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QUESTION 1
The materials balance principle states that, in the long run, the quantity of raw
materials extracted from the natural environment must equal the total residuals
returned to the environment, after accounting for recycling and temporary
accumulation. In simple terms, matter cannot disappear. What enters the economic
system as raw materials M must eventually leave as discharged residuals from
producers and consumers.
When a new plant or improved equipment is introduced, its impact depends on the
type of technology adopted. If the new plant is cleaner and more efficient, it may
reduce the residuals generated per unit of output. In terms of the materials balance
equation:
M = G + Rp − Rrp − Rrc
Where M is raw materials, G is goods produced, Rp is production residuals, and Rrp
and Rrc are recycled residuals from producers and consumers.