Seriously, Sraffa claimed that there is a multiplicity of interest ratest, and that there is no such thing as a natural interest rate. Then the anti-austrians (for example, Lord Keynes) wrongly believe that the ABCT is disproved. Not surprising when you think about how they misinterpret the ABCT. But like I said before, saying that the existence of multiplicity of interest rates disproves the ABCT is like saying that the amount of saving can’t determine the amount of money the bank could loan.
The only thing to remember : the less people consume and the more people save, the more banks loan money, and the more the production structure lengthens. That’s the core of ABCT.