Concerned by recent negative trends in economic indicators such as the consumer price index, gross domestic product, and inflation, the marketing manager of Kevin's Kayaks recommends that the company reduce its advertising spending. His recommendation is based on data.

Macroeconomics.

Explanation:

Economics can be classified into two (2) main categories, namely;

1. Microeconomics can be defined as the study of the effect of price and quantity levels through interactions between individual buyers and sellers in various markets. Simply stated, it focuses on analyzing or evaluating the decisions of consumers (buyers) and those of firms (sellers) such as methods of production, pricing; and the manner in which government policies affect those decisions.

2. Macroeconomics can be defined as the study of behaviors, performance and factors that affect the entire economy. Therefore, it focuses on aggregate phenomena such as price level, economic growth, Gross Domestic Product (GDP), inflation, unemployment and national income levels with respect to the central bank, demand or supply shocks, government policies, aggregate spending and savings.

In this scenario, concerned by recent negative trends in economic indicators such as the consumer price index, gross domestic product, and inflation, the marketing manager of Kevin's Kayaks recommends that the company reduce its advertising spending. Thus, his recommendation is based on macroeconomics data.

This ultimately implies that, macroeconomic is a form of externality that typically affects the levels of inflation, unemployment, consumer price index, or growth in the economy as a whole (GDP).