Digvrat had one basic objective. It was to put restraint on imperialistic (dominance of one over the other) mentality. Be it economic or geographical empire, it will not go beyond a particular limit.
There was a limit to transportation: it will not go beyond five hundred kilometers or such limit. Under this principle, there was a linear restriction in a linear direction, curved direction or downward direction or in any given direction. Outside this limit, one will not sell anything; one will neither import nor export. The restriction was with reference to direction.
The important principle proved to be effective in putting a check on imperialistic mentality.