Which of the following is not a common method of producing more income?

Selling is often associated with generating income, such as through the sale of assets or services. This method can provide immediate cash flow but does not inherently lead to producing more income in the long term. In contrast, conversion, cost reduction, and improvement are strategies aimed at enhancing the efficiency or value of existing resources, ultimately leading to sustainable increases in income.

Conversion typically involves changing the use of a property or asset to generate higher returns. Cost reduction focuses on decreasing expenses to improve the overall profitability of operations, allowing for more retained income. Improvement refers to making enhancements that increase the value or desirability of an asset, thereby potentially increasing rental or resale income.

Thus, while selling can generate one-time income, it does not align with the goal of consistently producing more income through the ongoing management of assets.