Step 1: Understanding the Concept:
Shifting cultivation (known as *Jhum* in North-East India) is an ancient, subsistence-level agricultural practice carried out by tribal communities in remote, mountainous, and heavily forested areas.
Step 2: Detailed Explanation:
1. Shifting cultivation areas are often isolated, lacking modern road connectivity, banking infrastructure, and formalized marketplace structures.
2. Under these primitive socio-economic conditions, cash currency is scarce, and formal retail systems are absent.
3. Consequently, tribal communities rely on the Barter system of sale, exchanging their agricultural produce (such as ginger, chillies, or tubers) directly for other essential goods (such as salt, iron implements, kerosene, or cloth) with neighboring groups or local traders.
Step 3: Final Answer:
The most common sale system practiced in remote shifting cultivation areas is the Barter system of sale.