I think for companies that big, they should be required to launch a tender just like public sector e.g. for a supply of beans. This means their own beans compan

I think for companies that big, they should be required to launch a tender just like public sector e.g. for a supply of beans. This means their own beans company would be excluded because of conflict of interest. It won't stop them from delivering beans to other companies though, but it will make a tax fiddle much more difficult.