Supermarket booze barns racing each other to the bottom

Just because you only spend $13 on your prosecco doesn’t mean you don’t care about wine. A few decades ago, the only wines you could buy under $10 were Passion Pop and discount Spumante. Today, Aldi spruiks an award-winning rose for $4.99, Woolworths-owned Dan Murphy’s sells a shiraz for $2.99 and now Coles’ newcomer Liquor Market is going with the slogan “low cost and so much more”. What’s changed to allow an influx of cheap barn-style bottle shops?