Alcohol Duty  and Unit Price
The plan to introduce a minimum unit price for alcohol in England seems  to be faltering. And I understand that in Scotland, though the law has been  passed that declares 50p to be the minimum price for a unit of alcohol, it has  not yet been possible to implement it. I also understand that in Scandinavia  they have opted to raise the price per unit by taxation, rather than by  declaring a minimum price per unit. Let us look at both ideas.
If the law insisted that the minimum price per unit of alcohol  were 45p it is assumed that the price of some cheap alcohol would have to rise.  Note that a unit of alcohol is defined as 10 mL (or 8g) of pure alcohol. This is  equivalent to a 25 mL measure of whisky (ABV 40%), or 250 mL of 4% beer, or 77mL  of red wine (of 13% ABV). (Density of alcohol = 1.2674 mL/g, or 0.789 g/mL.)  So a litre of beer would then cost a  minimum of £1.80 (in England, £2.00 in Scotland). But I have never seen beer at  anything under £2.18 per litre, and never drink anything that costs less than  £3 per litre.  The minimum price  for a bottle of red wine would be £0.45 x 75 x 0.13 = £4.39 (for a wine of 13%  ABV). While a bottle of whisky of 0.75 litres and 40% ABV would have a minimum  price of £13.50. I am not a great buyer of whisky, but I believe this is close  to the price I see in the supermarkets.
So the only effect of the minimum price of a unit being set  at 45 pence would be that cheap red wine, which I can currently buy at  £3.50 - £3.99 if I shop around, would rise to £4.39; with essentially no  change in the price of beer or spirits. This innovation would affect me, and  other drinkers of cheap red wine; and possibly some drinkers of very cheap  larger if bought in a shop I have not yet discovered. (The effect in Scotland is  considerably more marked, which may be why it is proving difficult to implement  there.)  Another effect of the  minimum price per unit of alcohol might be a small rise in the profits of the  supermarkets. 
Why have the Scandinavians opted for higher alcohol duty?  You might wonder what tax or 'duty' is  levied on a unit of alcohol in England. That is not quite straightforward, for  different beverages attract different rates of duty. I found the following data  (Table 1) on the HMRC  website for the rates of  duty introduced at the March 2012 budget. Working on the understanding that 1£  per hectolitre is equivalent to 1p per litre; and that 1 litre of wine at 10%  alcohol by volume (ABV) contains 100 mL of alcohol (i.e. 10  units), I calculate that the duty (in  pence per unit of alcohol) varies from 9.78p  for very weak beer (strength < 2.9% ABV), to 19.51 p for normal  beer (2.8% to 7.5%), to 24.39p per unit of strong beer (>7.5%ABV), to 25.33p  for wine, to 26.81p per unit for spirits. Cider is still anomalous in that duty  is only 10p per unit for most ciders. I expect that these difference for  different beverages have origins in history; they do not make much sense. It  seems to me that a small increase in alcohol duty might be just as good a way  of achieving the health benefits, and at the same time increase tax revenue. 
Table1 — Alcohol  duty (http://www.hmrc.gov.uk/budget2012/ootlar-main.pdf)
| 
Duty rate from 26 March 2012 | 
Rate (£) per    litre of pure alcohol (i.e. 100 units); so p/unit | 
Rate (£) per    hectolitre of product or (p) per litre | 
| 
Spirits | 
26.81 | |
| 
Spirits-based    RTDs | 
26.81 | |
| 
Wine and    made-wine: exceeding 22% alcohol by volume (abv) | 
26.81 | |
| 
Beer - lower    strength: exceeding 1.2% - not exceeding 2.8% abv. | 
9.76 | 
9.76 x strength (%)     11.7 – 27.3 | 
| 
Beer - General    Beer Duty: Exceeding 2.8% - not exceeding 7.5% abv. | 
19.51 | 
19.51 x strength    (%) | 
| 
Beer - High    strength: Exceeding 7.5% - in addition to the General Beer Duty | 
24.39 | 
(4.88+19.51) x    strength (%) | 
| 
Still cider and    perry: exceeding 1.2% - not exceeding 7.5% abv | 
10.0 (if 3.768%    abv) | 
37.68 | 
| 
Still cider and    perry: exceeding 7.5% - less than 8.5% abv. | 
10.0 (if 5.655%    abv) | 
56.55 | 
| 
Sparkling cider    and perry: exceeding 1.2% - less than 5.5%abv. | 
10.0 (if 3.768%    abv) | 
37.68 | 
| 
Sparkling cider    and perry: exceeding 5.5%abv- less than 8.5% abv. | 
24.532 (if 10%) 30.66 (if 8%) | 
245.32 | 
| 
Still wine and    made-wine: exceeding 5.5% - not exceeding 15% abv. | 
25.339 (if 10%) 19.5 (if 13%) | 
253.39 | 
| 
Wine and    made-wine: exceeding 15% - not exceeding 22% abv. | 
22.5 (if 15%) 16.89 (if 20%) | 
337.82 | 
| 
Sparkling wine    and made-wine: exceeding 5.5% - less than 8.5% abv. | 
24.532 (if 10%) 30.66 (if 8%) | 
245.32 | 
| 
Sparkling wine    and made-wine: exceeding 8.5% - not exceeding 15% abv. | 
32.456 (if 10%) 25 (if 13%) | 
324.56 | 
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