anchor.diff:          {
               "id": 2
           }
  -        
  +
   + Response 404 (application/json)
   
       + Body
  -    
  +
               {
                   "error": "Empty cart"
               }
  
positive.code: + Response 200 (application/json)
  
      + Body
      
              {
                  "products": [
                      {
  
negative.code:                 "products": "/markets/5/products"
              }
          ]
  
  ## Single Market [/markets/{market_id}]
  
  