text: import matplotlib.pyplot as plt
  
  mcm = McCallModel()
  V, U = solve_mccall_model(mcm)
  
  fig, ax = plt.subplots()
  
  ax.plot(mcm.w_vec, V, 'b-', lw=2, alpha=0.7, label='$V$')
  ax.plot(mcm.w_vec, [U]*len(mcm.w_vec), 'g-', lw=2, alpha=0.7, label='$U$')
  ax.set_xlim(min(mcm.w_vec), max(mcm.w_vec))
  ax.legend(loc='upper left')
  ax.grid()
  
  plt.show()
  