{
  "study": "zero_price",
  "selection": "Post-hoc positive direction at 100 synthetic answers",
  "synthetic": true,
  "human_n": 0,
  "conditions": [
    {
      "name": "paid",
      "questions": [
        {
          "id": "q1",
          "type": "single_choice",
          "text": "你只能选一件零食，你会选哪个？",
          "options": [
            "巧克力：2元",
            "糖果：1元"
          ],
          "required": true
        }
      ]
    },
    {
      "name": "free",
      "questions": [
        {
          "id": "q1",
          "type": "single_choice",
          "text": "你只能选一件零食，你会选哪个？",
          "options": [
            "巧克力：1元",
            "糖果：免费"
          ],
          "required": true
        }
      ]
    }
  ],
  "index_coding": "Choice values use one-based option order; open numeric answers stay numeric"
}