Classify the following Wall Street Journal articles as involving macroeconomic or microeconomic issues based on their titles:
a. “Bernanke Sees Long Slog to Trim U.S. Trade Deficit”
b. “How Drugs for Rare Diseases Became Lifeline for Companies”
c. “Monetary Tightening Damps Brazil Investment”
d. "Debut of Chicken Little Gives Disney Something to Crow Over”