[
  {
    "name": "Free beer",
    "description": "The work is easier when the worker is happy.",
    "cost": 100,
    "used": false,
    "type": "hr",
    "receiver": "PhD Students",
    "property": "rate",
    "factor": 1.2,
    "constant": 0,
    "image": "assets/beer.png"
  }
]