Design a house that could be sold for less than £180,000 but still makes you a profit. Get innovative and imaginative with construction methods to keep costs down. Make it spacious, light, beautiful, high quality, sustainable and energy efficient. Make it a home people want to live in. Make affordability a selling point.

The public sector in Scotland spends around £11 billion each year buying everything it needs to run the country. Things like wheelie bins, medicines, fire alarms for buildings, paper for schools, hospital equipment, medicines and stationery. A glance at Public Contracts Scotland, where all public sector contracts are advertised, shows the thousands of goods and services bought daily.

That's a lot of spending power. What would happen if the public sector harnessed some of that power and used it to persuade its suppliers to commit to using their resources to improve the lives of the communities and customers their products serve?