The courtyard economy refers to a form of management in which farmers take full advantage of the space of the family courtyard, the surrounding uncontracted open spaces, and various resources, and engage in highly intensive commodity production. According to the above definitions, Which of the following belong to the courtyard economy:. ['Planting flowers and plants on the balcony to beautify the living environment.', 'Carp culture in contracted ponds.', 'Establishing a handicraft weaving factory in a tiling house in his backyard.', 'Grazing herds on the grassland.']