Some results

• Students learn to produce on the PPF…
  
  Production in Portugal (game Ricardian, rounds 2 and 4, played in the fall of 2004)

  …and to gain from trade:
  
  Consumption in Portugal (game Ricardian, rounds 2 and 4, played in the fall of 2004)

• Market prices get closer to their theoretical values…
  
  

  ... though not always
  
  

• Analyzing trading errors can lead to an interesting class discussion and further learning: