I think ranking is here to stay. We have social media like yelp making it very easy and free to immediately rate a business one has just interacted with. eBay started the ranking system and your reputational rating there...by your customers and peers...is your most important asset. Transparency is here in this way and many more. Businesses have a role to play in allowing more transparency.
They can also meet and discuss their own role and impact on peace, as they do at Conscious Capitalism conferences, Doing Well by Doing Good meetings, Great Places To Work, where they encourage new and existing business owners to act in right relationship with all stakeholders and thus contribute to peace. Out of these conferences they can develop measures.
We say at Peace Through Commerce that peace is a byproduct of many actions which lead to justice, prosperity, pan-sustainability (meaning sustainable actions in the workplace as well as environmental sustainability), and human flourishing. Peace thus is a system of right action rather than a single state. When businesses become self-aware of their impact on peace, they can begin measuring their actions using new metrics, not just Wall Street metrics, and they can take some pride in doing the right thing now that we have a society waking up to measuring their good acts as importantly as profits.