Multiple Choice, Multiple Answers

Read the passage and select ALL correct options. Wrong selections lose points.

The modern sandwich industry, though built on a simple concept of fillings between bread, has become a substantial commercial sector encompassing pre-packaged supermarket lines, quick-service chains, and artisanal shops. Efficient supply chains allow ingredients to be prepared centrally and distributed to thousands of outlets daily, which keeps unit costs low but places heavy demands on refrigeration and just-in-time logistics to preserve freshness. Consumer surveys consistently show convenience, rather than price, as the primary purchase driver, prompting retailers to compete on speed and variety instead of discounting. In response to health-conscious demand, many chains have introduced lower-sodium and higher-fibre options, though these often carry a price premium that limits their share of overall sales. Waste remains a persistent challenge, as unsold pre-packaged sandwiches typically cannot be resold once their short shelf life expires.