I wouldn't be so hasty to call a lack of variety a result of efficiency. Sure that may be one factor, but it isn't trivial to ship such perishables like fruits

I wouldn't be so hasty to call a lack of variety a result of efficiency. Sure that may be one factor, but it isn't trivial to ship such perishables like fruits and vegetables half way around the globe in a way that consumers are willing to pay for quality that shows up. There are some products that just can't be transported in a way that maintains the level of quality a consumer would be willing to pay for.