The buffer-stock extension (section 3.9.4) replaces the baseline mean-field MPC with an individual adaptive rule based on buffer-stock saving theory.

Complementary CDF of household wealth on log-log axes, fitted against Singh-Maddala, Dagum, and GB2 distributions (Figure 3.8).
Run this yourself:
import bamengine as bam
from extensions.rnd import RND
from extensions.buffer_stock import BUFFER_STOCK
sim = bam.Simulation.init(seed=42)
sim.use(RND)
sim.use(BUFFER_STOCK)
results = sim.run(n_periods=1000, show=True)See the full example.