Is critical realism a modal realism?

One of Roy Bhaskar’s central ontological claims is that in addition to the actual – the things and events that occur in the material universe – our ontology must also recognise a domain of the real, which includes the actual, but extends beyond it. In his first book, A Realist Theory of Science, he argued that the non-actual includes real causal powers, a very strong argument that I explained towards the end of my last blog post. However, if we accept this argument this opens up rather a large question: what else could be real but not actual?