"Because consumers treat money as fungible giving them vouchers, no matter how they are labelled, has the same impact on their spending as increasing their income by an equivalent amount". Discuss this statement by (a) applying relevant intermediate microeconomic theory and (b) referring to the evidence in the research literature.

Use evidence from the following case studies:

Abler, J. and Marklein, F. (2017). Fungibility, labels and consumption, Journal of the European Association, Vol 15, pp. 99-127

Griffiths, R. von Hinke, S. and Smith S. (2018). Getting a healthy start: The effectiveness of targeted benefits for improving dietary choices. Journal of Health Economics, Vol 58, pp 176-187.

Beatty, T.K., Blow, L., Crossley, T. F. and O'Dea, C. (2014). Cash by any other name? Evidence on labelling from the UK Winter Fuel Payment. Journal of Public Economics, 118, pp.86-96

Bradford, N. and Shaviro, D. (1999). The economics of vouchers, NBER Working Papers No. 7092

Hener, T (2017). "Effects of labelled child benefits on family savings," Review of Economics of the Household, Springer, vol. 15(3), pages 759-777, September.