What the distinction in context of social and economic status allocated to castes between scriptural concept and that was practiced since ancient period in History?

As per scriptual concept, the Brahmans were neither supposed to amass wealth nor were subordinated to the kings and rulers belonging to Ksatriya caste. For instance, even today, we see an Ksatriya individual of eighty, touches feet of eighteen year old brahmin. However, in actual practice, prevailing since ages in the past, there is correlation between social and caste statuses. The high castes were almost of high economic status while the low castes were almost always of low economic status.