Equal Exchange customers often ask if they can donate to the company to support its economic justice and environmental work. As a for-profit venture, the purveyor of organic, fair-trade coffee, chocolate, tea, and other foods used to turn them down. Not anymore.  Five years ago, Equal Exchange opened a donor-advised fund to streamline grantmaking to its supplier community and open up opportunities for collaborative giving. The company contributes most of the money in its DAF, but customer donations swell the fund. “The way we work with our community of cooperative farmers is multifaceted, going beyond just a purchase order for…