It depends on the percent of people on UBI; if it is 5-10% it will be injecting money on the market without products and services to match; if it's 80% it will make everything a lot cheaper because the demand-supply will shift to cheaper products that 80% of the buyers are looking for. Think about the 5000 Euro car Renault built and sold in Europe while their other cars were selling for 20-30,000 Euro.