Key limitations of this theory include unrealistic assumptions around costs i.e. all non-labour production costs are not accounted for, with no consideration given to the role of transport costs.
[Nodyn 3] Mae’r costau hyn yn cynnwys gwariant ar waith a wnaed gan gontractwyr amaethyddol, gan gynnwys costau deunydd fel gwrtaith, oni bai bod modd eu nodi o dan bennawd penodol.