Reply to the 'Comment on "How to interpret Onsager cross terms in mixed ionic electronic conductors"' by H.-I. Yoo, M. Martin, and J. Janek, Phys. Chem. Chem. Phys., 2015, 7, DOI: 10.1039/C4CP05737F

The origin of the Onsager cross terms in mixed-ionic-electronic-conductor (MIEC) oxides is re-examined. Experiments are suggested to determine which of the two suggested explanations is applicable. The Onsager cross terms are re-examined. Two experiments are suggested to test which of two alternative explanations for these terms is valid.