In the consumption equation, the slope of the consumption function is represented as:

$c$

The correct answer is Option (1) → $c$

In the consumption function, typically written as:

C = $\bar C + cY$

• $\bar C$ is autonomous consumption (consumption when income is zero)

• c is the marginal propensity to consume (MPC) — the slope of the consumption function

• Y is the income

The slope of the consumption function represents how much consumption changes with a change in income, and this is given by c.