Chris is proud that he helps people gain access to mineral products that are normally very difficult to purchase in a small amount, in it's purest form. Chris buys essential oils like mint, lavender, or oregano oil directly from farmers in bulk, and then he resells it to clients in smaller amounts that tend to last them for a long period of time. However, sometimes Chris has a stock of oil in his garage that stays there for months. This is an example of which function of an intermediary?