Mums are getting excited about flash sales site Zulily, and it’s not hard to see why. Constant discounts, 9,000 new items posted daily and ‘buy-it-now’ emails are selling them everything from yoga pants to fridge organisers, attracting four and a half million customers in five years. Will this success last?

Beautiful craftsmanship and fine fabrics aren't cheap, especially given the 800% markup between factory and shop floor. But now that US start-up Everlane is cutting the middle man to make ethical premium clothing affordable, its ‘radical transparency’ could really shake things up.

Tiger, a Danish discount retailer with a difference, is winning over British shoppers with its irresistible formula of stylish, fun and cheap products. How has it managed to earn a reputation as the UK high street's most intriguing new ‘posh pound shop’?

No one wants to wait. Whether it's for a pair of shoes you need for later tonight, the latest HBO series or a mechanic to fix your dodgy exhaust. On-demand is the new norm. For taxis, there’s Uber, for takeaway, there’s Just Eat, and now, for groceries in the US, there’s Instacart.

Everyone loves saving that little bit extra when they shop. Marketers have a number of techniques at their disposal; free shipping, 10% off or BOGOF for example. Research shows that the discounts you are drawn to and prefer actually change with age.

Google Shopping Express is a revolutionary service that will offer same-day delivery for everything from groceries to electric guitars. With convenient time slots and easy ordering, it's not delivering products, it's delivering free time.

With informed shoppers demanding more choice and less hassle, new imperatives are emerging for retailers. Many are fragmenting into access points or experiential hubs in order to offer the best of online, offline and mobile.

How important is click and collect? What changes will supermarkets have to make to survive? How will shoppers become even more savvy? And which retailers are the ones to watch? As part of our Expert Outlook 2015 series we speak to three retail experts about the future of shopping.