Businesses most of the time do not require business partners at the initial stage of the business, it is when the business grows in numbers that the need to employ more hands as well as business partners do set in. So, I mostly like to align the need for business partnership to the expansion of the business and not the trade itself. Whether it's a product selling business or service rendering company, the need for partnership in every big business cannot be overemphasized and it is mostly directly proportional to the growth of the business, unless of course, it the business does not Harbour the right partnership in the first instance.
What you say is very logical and quite reasonable for business matters because all business people must be aware of this so that they don't take the wrong steps when opening a new business. Because new business people usually have to focus more on sales and monthly income so that one day they can open branches and attract business partners who can benefit each other. Apart from that, when it comes to hiring other people as employees, the businessman himself must also pay attention because initially every businessman doesn't need to think about this as long as all the work can still be done by himself.