Impact of a sugar-sweetened beverage tax on sugar producers in Ukraine.

Taxes on sugar-sweetened beverages can promote health and raise revenue. Whether these taxes negatively impact domestic sugar producers, an argument often made by opponents, is understudied. We extended a simulation model based on a uniform specific volume-based tax of UAH 4/L in Ukraine. We estimated best- and worst-case scenarios for reductions in domestic sugar demand to be 162 and 23 000 metric tons. This is at worst ∼0.5% of current exports, meaning decreases in domestic demand could easily be absorbed by export markets given export trends. Due to highly protectionist sugar sector policy, sugar producers would not be able to fully substitute domestic sales revenues through increased export revenues, but the worst-case revenue gap was <0.5% of total sectoral output in recent years. Overall, introducing a tax on sugar-sweetened beverages in Ukraine is likely to have a very limited impact on domestic sugar producers.

Exchange rates and multicommodity international trade: insights from spatial price equilibrium modeling with policy instruments via variational inequalities.

In this paper, we construct a multicommodity international trade spatial price equilibrium model of special relevance to agriculture in which exchange rates are included along with policy instruments in the form of tariffs, subsidies as well as quotas. The model allows for multiple trade routes between country origin nodes and country destination nodes and these trade routes can include different modes of transportation and transport through distinct countries. We capture the impacts of exchange rates through the definition of effective path costs and identify the governing multicommodity international trade spatial price equilibrium conditions, which are then formulated as a variational inequality problem in product path flows. Existence results are established and a computational procedure presented. The illustrative numerical examples and a case study are inspired by the impacts of the war against Ukraine on agricultural trade flows and product prices. The modeling and algorithmic framework allows for the quantification of the impacts of exchange rates and various trade policies, as well as the addition or deletion of supply markets, demand markets and/or routes, on supply and demand market prices in local currencies, and on the volume of product trade flows with implications for food security.