All the migrations postulated by Renfrew ultimately stem from a single catalyst: the crossing of Anatolian farmers into Greece… For all practical pur… - Colin Renfrew

This area [east Macedonia], although firmly now part of Greece, has sometimes been a marginal one, and may at times have owed allegiance in different directions through a process of boundary displacement. It was indeed occupied in early classical times by Thracian tribes, barbarians who did not speak the Greek language. No doubt they did indeed speak a Thracian language akin to that in what is now Bulgaria, whose origins were suggested earlier.

In the Indo-European field, linguists have been willing to follow the archaeological orthodoxy of nearly a century ago, while archaeologists have taken the conclusions of the historical linguists at their face value, failing to realize that they were themselves based upon archaeological assumptions which had not been questioned, yet which were not, in some cases, justifiable.

This hypothesis that early Indo-European languages were spoken in north India with Pakistan and on the Iranian plateau at the sixth millennium BC has the merit of harmonizing symmetrically with the theory for the origin of the Indo-European languages in Europe. It also emphasizes the continuity in the Indus Valley and adjacent areas from the early neolithic through to the floruit of the Indus Valley civilization.