Theory of production

Traps in Theory of production

• Uses the wrong arithmetic operation
  Write the definition in words first (TR = price × quantity; ATC = TC ÷ Q) and only then put in numbers. Check units: totals and averages cannot be added.
• Stops at a different economic quantity
  Underline what the question asks for and check the final number is THAT quantity, not a step on the way.
• Gives only part of the answer
  List every component in the definition (GDP = C + I + G + (X − M)) and tick them off before answering.
• Uses the everyday meaning of a term
  Economic terms have precise definitions. Recall the textbook definition before matching.
• Chooses a true but irrelevant statement
  Re-read the question's key term and test each option against it, not against whether it is true in general.
• Picks a closely related concept
  Learn related terms as contrasting pairs with one-line definitions, and identify which one the stem describes.
• Confuses market structures
  Perfect competition: many firms, homogeneous product, price takers. Monopoly: one seller, barriers. Oligopoly: few interdependent firms.
• Confuses cost concepts
  TC = TFC + TVC. AC = TC/Q. MC = ΔTC/ΔQ. Fixed costs do not change with output.
• Confuses laws of returns and returns to scale
  Law of diminishing returns: adding a variable factor to a FIXED factor eventually lowers marginal product (short run). Returns to scale: all factors changed together (long run).
• Division of labour misconceptions
  Advantages: skill, speed, use of machinery. Disadvantages: monotony, loss of craftsmanship, interdependence. Limited by the size of the market.
• Mismatches factors of production and rewards
  Land → rent; labour → wages; capital → interest; entrepreneur → profit.
• Reverses the direction of the effect
  Trace the chain step by step (e.g. buying securities → banks gain cash → money supply rises) and check the sign at every link.
• Confuses monetary and fiscal policy tools
  Monetary (central bank): interest/policy rate, open market operations, reserve requirements. Fiscal (government): taxation and public spending, budget deficit/surplus.
• Labour market misconceptions
  Wages are influenced by demand and supply of labour, trade union bargaining, minimum wage laws and productivity. Unemployment types: frictional, structural, cyclical, seasonal.
• Gives a number from the question as the answer
  If your answer appears in the question, check again: the question almost never asks you to copy a figure. Work out the required quantity from its definition.
• Applies the rule for the opposite case
  Before answering, name the case in the stem (inelastic? price floor ABOVE equilibrium? point INSIDE the PPC?) and recall the rule for that case only.
• Confuses total, average and marginal product
  AP = TP/L; MP = ΔTP/ΔL. When MP > AP, AP rises; when MP < AP, AP falls; MP = AP at the maximum of AP. TP is maximum when MP = 0.
• Confuses forms of business organisation
  Sole trader: one owner, unlimited liability. Partnership: 2–20 partners, usually unlimited liability. Limited company: separate legal entity, limited liability. Co-operative: one member one vote, surplus shared by patronage.