Details of sourcing requirements are, however, in most cases kept confidential. At a broader scale, it can be observed that retailers are reacting to the proliferation of eco-labels for all types of products by developing their own ecological brands. This can reduce compliance costs and buyer confusion if buyers trust the brand to embody the desired product qualities. However, self-claims like “sustainably harvested” leave ample room for interpretation if not tied to a specific verifiable set of rules backing that claim. The companies also decide on the type of compliance verification (first, second or third party certification).