This is due to stablenature of the business, as raw material costs have been relatively stable thanks to long-term purchasing agreements with farmers and growers worldwide.
To understand the stablenature of subscription fee stream, we can look at how subscribers and fee per subscriber have trended over the course of the past few years.
In the past year these repackaged and rerated pools of debt, which should have enjoyed stable ratings because of their diversified nature, have suffered a sudden spate of downgrades.
But Dr Zheludev has found that a similar effect can be achieved by keeping the temperature stable and using a beam of light to manipulate gallium's metallic nature.