"Engel curve" meaning in All languages combined

{
  "etymology_text": "After the statistician Ernst Engel.",
  "forms": [
    {
      "form": "Engel curves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Engel curve (plural Engel curves)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A theoretical economic curve that describes how household expenditure on a particular good or service varies with household income."
      ],
      "id": "en-Engel_curve-en-noun-VXVcphEA",
      "links": [
        [
          "theoretical",
          "theoretical"
        ],
        [
          "household",
          "household"
        ],
        [
          "expenditure",
          "expenditure"
        ],
        [
          "good",
          "good"
        ],
        [
          "income",
          "income"
        ]
      ],
      "wikipedia": [
        "Engel curve",
        "Ernst Engel"
      ]
    }
  ],
  "word": "Engel curve"
}

{
  "etymology_text": "After the statistician Ernst Engel.",
  "forms": [
    {
      "form": "Engel curves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Engel curve (plural Engel curves)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A theoretical economic curve that describes how household expenditure on a particular good or service varies with household income."
      ],
      "links": [
        [
          "theoretical",
          "theoretical"
        ],
        [
          "household",
          "household"
        ],
        [
          "expenditure",
          "expenditure"
        ],
        [
          "good",
          "good"
        ],
        [
          "income",
          "income"
        ]
      ],
      "wikipedia": [
        "Engel curve",
        "Ernst Engel"
      ]
    }
  ],
  "word": "Engel curve"
}