The impact of granting privileges to the marcha Earls
Made it easier for them to control their earldoms and gave them a greater grip on the whole region
Allowed them to create buroughs or towns, markets, and churches without the king's special permission, encouraging wealth and trade in their LOM, bringing stability, and helping pay for defenses
Granted full power to enforce the law to the Earls, with Reeves working directly for the Earl and not for the king, enabling swift decisive action when dealing with threats
Marcha Earls paid no tax on their land, keeping them loyal and allowing investment in defenses
Allowed them to build castles in their earldoms without the king's prior permission, aiding in defense and control of the Welsh border