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# Exercise: Sales Forecast using MCM

Apr 9, 2019 #monte-carlo

## Background

Often, Monte Carlo simulation can come in handy to calculate risk or evaluate investments in projects. This is a simple demonstration.

## Exercise

The following provides the breakdown of profit made by a business unit. All metrics are measured in daily basis.

Profit = Income - Expenses

Income = Sales (S) * Profit Margin per Sale (M)

M assumes an uniform dist. from $350 to$400

S = Number of Leads (L) * Conversion Rate (R)

L assumes an uniform dist. with from 3000 to 4000

R assumes a normal dist. with mean of 4% and sd of 0.5%

Expenses = Fixed Overhead (H) + Total Cost of the Leads (C)

Cpl assumes an uniform dist. from $8 to$10

H assumes a constant of $20000  In summary, Profit = Leads * Conversion Rate * Profit Margin per Sale - (Cost per Lead * Leads + Fixed Overhead) ## Profit Forecast Model An oversimplified daily profit forecast model, If we set a profitability goal of$100,000 a month, what is the probability that we achieve that? How about the probability that we lose money?

## [1] "Probability of hitting goal is 4%"
## [1] "Probability of incurring losses is 22%"

We can also plot the cumulative probability for clearer visualization.

## Update Model

What if we further assume that cost per lead and conversion rate are correlated?

## [1] "Probability of hitting goal is 21%"
## [1] "Probability of incurring losses is 36%"

## Sensitivity Analysis

What if we are offered an option to increase our leads at the cost of fixed overheads increase?

## [1] "Probability of hitting goal is 18%"
## [1] "Probability of incurring losses is 51%"

## Finding Optimal

What is the maximum cost per lead we can accept if we wish to cover our probability of losses at X%?

## [1] "Maximum cost per lead allowed to reduce risk down to 0.05 is \$9.4"