...We assign long- and short-term senior unsecured debt and issuer ratings of A3 and Prime-2, respectively, to Nacional Financiera, S.N.C., Instituci=n de Banca de Desarrollo (Nafin), with a stable outlook, and Aaa.mx/MX-1 Mexican national scale issuer ratings. Nafin's ratings take into account our assumption of a very high likelihood of support from the Government of Mexico (A3 stable) and a standalone Baseline Credit Assessment (BCA) of ba1 based on the bank's relatively low risk profile. The risk profile is underpinned by the bank's primary focus on second-floor financing, with exposures mainly to banks and other types of financial institutions rather than direct financing to the ultimate borrowers. The BCA is also underpinned by Nafin's ample high-quality capital. Nafin's standalone strength is constrained by its high reliance on market funding, which increases re-pricing risks. The BCA is also constrained by the bank's limited business scope because it caters mainly to micro, small and...