Physical availability is the reach and ease of the places where a buyer can actually obtain a brand. Even a memorable brand loses a sale when stores, stock, delivery or checkout are unavailable.
The demo adds reachable purchase points around a buyer. In practice, compare local stock, channels, delivery coverage and completed purchases.
More listed outlets do not improve availability if products are out of stock or hard to buy.
When to use
Use when awareness is strong but sales lag in certain places or channels.