Installation

merton supports Python 3.11 — 3.14 on macOS (Intel + Apple Silicon), Linux (x86_64 + aarch64), and Windows.

Minimum (CPU NumPy)

uv pip install merton          # or: pip install merton

This installs the core dependencies (NumPy, SciPy, pandas, Numba, structlog, Pydantic, joblib, Typer) and gives you single-firm fitting + the vectorized math primitives.

Optional extras

Goal	Install
GPU (CUDA 12)	pip install "merton[gpu]"
JAX autodiff calibration	pip install "merton[jax]"
Apple Silicon GPU	pip install "merton[mlx]"
Excel integration	pip install "merton[excel]"
Plotting (matplotlib + plotly)	pip install "merton[viz]"
Bayesian MCMC calibration	pip install "merton[mcmc]"
OpenTelemetry tracing	pip install "merton[obs]"
Market-data adapters (yfinance, FRED)	pip install "merton[data]"
Everything	pip install "merton[all]"

Verifying the install

python -c "import merton; print(merton.__version__)"

You should see a version string. Then trigger a small fit:

from merton import Firm, fit
firm = Firm(equity=100, debt_short=20, debt_long=30, equity_vol=0.30)
print(fit(firm).summary())