I would attribute more toward the appeasement aspect of Europe that WWII actually began, and that the economy was also supported by the new revenue caused by appeasement.
But I always considered the rise in the economy to have preceded the appeasement. To me it seemed as if the economy was already rising, and appeasement just helped it along its way. I mean, the most obvious case of early appeasement was in the 1936 occupation of the Rhineland. Even if you count them allowing Hitler to build up his army that only goes as far back as 1934. But before then the economy, to my knowledge, was already improving. It was improving despite the fact that all those reparations had been paid. Granted, Germany hadnt payed the full original quotient, but that was out of an agreement, not a breaching of terms.