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# Economics/Lift or Escalator for Metrorail.

Question
Dear Prof Raza

Which will be a better Choice for Metrorail?.

Is it Lift or Escalator?.

Thanks & Regards,
Prashant S Akerkar

Hi Prashant,

I have already given an answer to use of escalator. This question of yours is rather simpler.

In Metrorail, you normally do not have to have building with more than 3 or 4 levels, usually including one or two basement (underground) levels in some countries like the U.S. or Canada.

In view of the above, escalator installment and maintenance would pose no problem. There may as well be lifts (elevators). However, owing to the constant traffic and the hectic nature of traffic, escalators are better option.Of course, when helping passengers with disability is concerned, lifts may go in tandem.

On the whole, my vie is that Escalator is a better option [though elecricity cost may be a concern in countries like India].

I hope this explains your query.

Best of luck, Prashant.
Questioner's Rating
 Rating(1-10) Knowledgeability = 10 Clarity of Response = 10 Politeness = 10 Comment Dear Prof Raza Thanks. Thanks & Regards, Prashant S Akerkar

Economics

Volunteer

#### Eklimur Raza

##### Expertise

It appears some students in this website are confused about elasticity of demand and the slope of the demand curve when they are trying to figure out why rectangular hyperbola comes up in case of unitary demand curve. First, they don't know that RH can be depicted in a positive quadrant of price,quantity plane. Secondly, they make the mistake that the slope of RH is constant at -1. Two points could help them: first, e=1 at each and every point of the RH, because the tangent at any point shows lower segment=upper segment (another geometric definition of e); yet slopes at different points,dQ/dP, are different; second, e is not slope but [(Slope)(P/Q)]in absolute terms. Caveat: only if we measure (log P) along the horizontal axis and (log Q) up the vertical axis, can we then say slope equals elasticity --in which case RH on P,Q plane is transformed into a straight-line demand curve [with slope= -tan 45 deg] on (log Q),(logP) plane, and e= -d(log Q)/d(log P). [By the way, logs are not used in college textbooks --although that is helpful in econometric estimation of elasticity viewed as an exponent of P, when demand equation is transformed into log-linear form.] I have not found the geometrical explanation I have given in any textbook followed in undergraduate and college classes in Canada (including the book followed in a university where I taught for a short time and in the book followed in George Brown College, Toronto, where I teach.

##### Experience

About 11 years' teaching economics and business studies, and also English, history and elementary French.Practical experience in a development bank, working with international donor agencies like the World Bank and the ADB. Experience in free-lance journalism, including Canada's "National Post."

Organizations
I teach micro- and macroeconomics at George Brown College (continuing education), Toronto, ON, Canada.

Publications
Many articles and editorials, on different subjects, in English newspapers. Recently an applied Major Research Paper, based on a synthesis of the Solow growth model and the Lewis two-sector model, has be accepted by Ryerson University, Toronto. Professors Thomas Barbiero and Eric Cam, Ryerson University, accepted the paper.

Education/Credentials