Before revision: Core business functions are always directly involved in the primary cash flows of the revenue model or models of the business, whereas non-core business functions usually are not, meaning that the business can technically operate without them .
After revision: Core business functions are always directly involved in the primary cash flows of the revenue model or models of the business, whereas non-core business functions usually are not, meaning that the business can technically operate without non-core business functions without impacting the primary cash flows, whereas the core business functions are essential to the continuance of primary cash flows .