def test_fixed_marginal(self):
"""Problem 5.4
"""
sp.var('q p', positive=True)
mkt = Market(q, p, demand=1000 - p, supply=sp.Eq(p, 100))
self.assertEqual(mkt.equilibrium(), (100, 900))
self.assertEqual(mkt.free_market_social_surplus(), 405000)
mkt = Market(q, p, demand=1000 - p, supply=sp.Eq(p, 250))
self.assertEqual(mkt.free_market_social_surplus(), 281250)
firm = Firm(q, p, variable_cost=q**2 / 2, SFC=0, FC=0)
print firm.supply()
market = Market(q, p, 100 - p, firm.supply())
print market.equilibrium()
def test_fixed_marginal(self):
"""Problem 5.4
"""
sp.var('q p', positive=True)
mkt = Market(q, p, demand=1000-p, supply=sp.Eq(p, 100))
self.assertEqual(mkt.equilibrium(), (100, 900))
self.assertEqual(mkt.free_market_social_surplus(), 405000)
mkt = Market(q, p, demand=1000-p, supply=sp.Eq(p, 250))
self.assertEqual(mkt.free_market_social_surplus(), 281250)
firm = Firm(q, p, variable_cost=q**2/2,
SFC=0, FC=0)
print firm.supply()
market = Market(q, p, 100-p, firm.supply())
print market.equilibrium()
def test_subsidy(self):
"""Problem 3.3
"""
sp.var('q p', positive=True)
firm = Firm(q, p, q**2 / 1000., SFC=0, FC=0)
self.assertEqual(sp.solve(firm.supply() - 1000, p)[0], 2)
def test_surplus(self):
"""Practice problem 3.4
"""
sp.var('q p')
firm = Firm(q, p, q**2 / 10., SFC=0, FC=0)
self.assertEqual(firm.surplus_at(p=10), 250)
def test_subsidy(self):
"""Problem 3.3
"""
sp.var('q p', positive=True)
firm = Firm(q, p, q**2/1000., SFC=0, FC=0)
self.assertEqual(sp.solve(firm.supply() - 1000, p)[0], 2)
def test_surplus(self):
"""Practice problem 3.4
"""
sp.var('q p')
firm = Firm(q, p, q**2/10., SFC=0, FC=0)
self.assertEqual(firm.surplus_at(p=10), 250)
