The tariffs and retaliation that occurred in 2018 combined with interest rate hikes will slow economic growth in the Central Valley more than in other regions, and the lasting result will be slower economic growth in the Central Valley through 2019 and possibly beyond. That outlook is according to the biannual San Joaquin Valley Business Forecast produced by Gökçe Soydemir, the Foster Farms endowed professor of business economics at Stanislaus State.