Zins

import numpy as np
import matplotlib.pyplot as plt

# Parameter
x0 = 1000000          # Anfangskapital

t_end = 30           # Jahre

s1 = 0.01         # Zinssatz
x1 = np.zeros(t_end+1)
x1[0] = x0
for i in range(0, t_end):
    x1[i+1] = (1 - s1)  * x1[i]

s2 = 0.05         # Zinssatz
x2 = np.zeros(t_end+1)
x2[0] = x0
for i in range(0, t_end):
    x2[i+1] = (1 - s2)  * x2[i]

s3 = 0.12         # Zinssatz
x3 = np.zeros(t_end+1)
x3[0] = x0
for i in range(0, t_end):
    x3[i+1] = (1 - s3)  * x3[i]

# Plot
plt.figure(figsize=(8, 5))
plt.plot(range(t_end+1), x1, label="1% Steuer X1", color="blue")
plt.plot(range(t_end+1), x2, label="5% Steuer X2", color="red")
plt.plot(range(t_end+1), x3, label="12% Steuer X3", color="green")
# Legende aktivieren
plt.legend()
plt.title("Vermögenssteuer (x=1000000, t=30)")
plt.xlabel("Jahre")
plt.ylabel("Vermoegen")
plt.grid(True)
plt.show()