What do we call a stock or supply of money, materials, staff, and other assets that can be drawn on?

The term that encompasses a stock or supply of money, materials, staff, and other assets that can be drawn on is referred to as resources. This can include various forms of capital—such as financial resources, human resources, and physical assets—all of which are necessary for an organization or operation to effectively function and achieve its goals. Resources can be utilized in planning and strategy to ensure optimal performance, making them a fundamental concept in both business and public administration contexts.

While the other terms, such as inventory, assets, and capital, represent specific components of resources, the term 'resources' is broader and encompasses all available assets that an organization can utilize to support its activities and enhance productivity. This makes it the most inclusive and accurate choice in the context of the question.