(a) If two or more commission merchants are employees or agents solely for one person, they may be covered by a single bond in an amount determined under § 147.023 of this code on the basis of combined purchases and sales.
(b) Two or more commission merchants not subject to Subsection (a) of this section may be covered under a single bond in an amount not less than the aggregate amount of individual bonds required under § 147.023 of this code.