Minimum "wage" might be £5.93, but minimum labour cost is much higher.
Remember, that comes with an additional 8% holiday entitlement and 13% Employers national insurance.
Thats £7.23 before you look at any other costs.
No it's not. The NI tables for an hourly rate of £5.93 at 35 hours per week, at the employers 'contracted in' A rate (highest rate, where the employee does not have another pension scheme and is contracted into the state scheme) is £38.91 per month, which works out at 4.4% of pay. NOT 13%. The reason being that you pay nothing at all on the majority of that pay as most of it is below the threshold. 13% is the marginal rate, 4.4% at that rate of pay is the average/total rate.
I leave to one side the issue of why people on these rates are paying any tax or NI at all (the thresholds will be rising further next year to take more people out), but you really don't seem to have a grasp of basic facts.
Worth noting that a country that would rather put a left-winger up against the wall and shoot him than allow him to run the country, the good old US of A, has had minimum wage legislation for far longer than we have.
And worth noting also that it's perfectly feasible to circumvent minimum-wage laws by, for example, using volunteers or interns. Internships are now pretty standard in many sectors e.g. for new graduates.
In my own experience, the decision to hire is exclusively related to (a) money coming into the business and (b) things that need to be done, which of course are inter-related, and *never* to pay rates. I've often been approached by people wanting to do (free) internships (by people with, as a minimum, a Master's degree providing good domain knowledge), but have never taken them on, even though they were free. But I have paid people (several times minimum wage) to do particular roles at given times, for periods up to two years.
Firms that are paying minimum wage - and would be happy to pay less - are not, for the most part, stony-broke: they are the big supermarket chains, the fast-food chains and the big banks (armies of cleaners and caterers in the City for example) and similar of this world, making vast sums and paying very high salaries and bonuses at the top, with many shareholders to keep happy. They are the same people that pay farmers less than cost for supplying milk, or that charge you £50 for sending you a letter about your bank account.