Argentina has expressed its concern over the provisions in the CBI concerning sugar. As an enticement, the US could offer a duty-free quota equivalent to their current export level of sugar. However, such an action could undermine our sugar support program, and severely detract from the unique CBI package.
(Source: Foreign Relations of the United States, 1981–1988, Volume XIII, Conflict in the South Atlantic, 1981–1984 - Office of the Historian)
What does CBI mean in the context?