15. If the lender is a person to whom all or part of the purchase price of forest assets, interests in a forest producer or non-voting or preferred shares in a forest producer is owed, the interest rate may be set for a period not exceeding 10 years, if the parties so agree. That interest rate may not exceed, for the chosen term, the current hypothecary interest rate of any of the financial institutions listed in paragraph 2 of the definition of “hypothecary interest rate” in section 2.