The value of Pref shares vs ordinary ones

Investors drove up prices of several preference shares on the Jamaica Stock Exchange in 2023 to unrealistic levels that defile logic, while ordinary shares can enjoy unlimited rise driven by growth in profits the same is not the case for preference shares that have limited potential for growth.
Many of those listed on the JSE have limited life spans as they are primarily income generating instruments, with a finite life span. The JMMB preference shares are in this category. The old JPS preference shares that were issued at $2 each have declined in value due to a decline in interest rates but the supply of these are very limited. These seem to have no set date to be repaid.
Investors may be confused about the likely value of Transjamaican 8.5 percent preference shares. Some think the fair value should be closer to $4, but that is not so and will only be the case if market interest rates fall below 8.5 percent, even then the short term nature of these shares makes it unlikely that rational investors would push the price to that level. The Transjamaican preference shares have an 8 year timeline, with annual repayment of principal starting on the 6^th anniversary.
The true value of the ordinary shares should be over $4. They currently provide a dividend yield close to where the preference shares trade currently, with expectations that there will be a greater level of dividend payment in the future.
Ordinary shares offer unlimited capital appreciation and the potential for an endless dividend stream depending on the level of profit generated. Preference shares have limited capital upside potential unless they have participative features, allowing them to share in profits over and above the coupon rate.
None of the preference shares listed on the Jamaica Stock Exchange have participation features. Long ago the shares of Jasmaica Livestock that were listed on the local exchange had such a feature. With interest rates on the Bank of Jamaica certificate of deposits just under 11% currently, the prices of the preference shares on the market should have declined to better equate the yields with the CD rates and as these rates fall, the share prices should be rising to reflect the better returns from Preference shares that is possible.