Wert-Berater, Inc. — Independent Feasibility Study Consultants
Feasibility Study Blog · Methodology

Monte Carlo Simulation: Probability, Not Theater

Run properly, simulation answers the one question deterministic tables cannot: what is the probability coverage holds?

Cars parked in front of a retail store
Monte Carlo Simulation: Probability, Not Theater

Deterministic sensitivity asks what happens at chosen shock levels; Monte Carlo asks how likely the bad levels are. The method draws thousands of scenarios from probability distributions assigned to the key inputs — revenue growth, occupancy or capture, operating margins, rates — and reports the resulting distribution of outcomes: the probability that year-one coverage exceeds 1.15x, the fifth-percentile DSCR, the likelihood the project ever breaches 1.00x across the horizon.

The honesty of the exercise lives entirely in the inputs. Distributions must come from evidence — the dispersion observed in comparable operations, published industry ranges, the project’s own contract structure — and correlated inputs must be correlated in the model: occupancy and rate move together in hospitality; volume and margin fight each other in fuel retail. An uncorrelated simulation over invented distributions is theater with error bars.

Reading the Output Like an Underwriter

The committee-relevant outputs are few: the probability of clearing the program minimum in the binding year, the downside percentile coverage, and the input the outcome is most sensitive to — the tornado’s top bar — because that is where conditions and covenants should attach. A simulation showing a 92 percent probability of clearing 1.15x with the residual risk concentrated in ramp speed tells the lender exactly what reserve to require.

Wert-Berater includes Monte Carlo analysis in the standard study package alongside — never instead of — the deterministic tables, because the two answer different questions and committees deserve both.

Donald Safranek, MSc — President and feasibility study consultant, Wert-Berater, Inc.
Donald Safranek, MSc

President, Wert-Berater, Inc. — independent feasibility study consultants since 1998. More than 4,000 feasibility studies completed across all 50 states and internationally, evaluating $40.2 billion in project value for SBA, USDA, EB-5, conventional, and institutional financing decisions. Fiduciary duty runs to the lender and agency in every engagement.

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