Bartering on purchases can still be done, you just have to initiate it. Helps if the person knows what they're doing, and has some authority to do so, or can get someone who does.

For wage negotiations, if you work for a small business in a somewhat skilled position, that certainly helps. A single staff member can be a significant bottle neck, unlike in a larger corp. Finding new (competent) staff, and training them can also be a noticeable expense. The only issue now is whether that company is capable of remaining afloat with everything going on.

It can still be done, you just have to initiate it. Helps if the person knows what they're doing, and has some authority to do so, or can get someone who does.