This ProBuilder code snippet demonstrates how to implement dynamic position sizing in trading strategies based on the equity level. It provides three modes of money management to adjust the position size according to changes in equity, which can be crucial for risk management in trading systems.

//Variables
MoneyManagement = 0
Capital = 10000
MinBetSize = 1
Equity = Capital + StrategyProfit

//Increasing and decreasing position size
IF MoneyManagement = 1 THEN
    PositionSize = Max(MinBetSize, Equity * (MinBetSize/Capital))
    PositionSize = Round(PositionSize*100)
    PositionSize = PositionSize/100
ENDIF

//Increasing only position size
IF MoneyManagement = 2 THEN
    PositionSize = Max(LastSize, Equity * (MinBetSize/Capital))
    PositionSize = Round(PositionSize*100)
    PositionSize = PositionSize/100
    LastSize = PositionSize
ENDIF

//Level position size
IF MoneyManagement <> 1 and MoneyManagement <> 2 THEN
    PositionSize = MinBetSize
ENDIF

This code snippet is structured to adjust the trading position size based on the current equity and a predefined money management strategy. Here’s a breakdown of its functionality:

• Variable Initialization: Sets up initial values for money management mode, starting capital, minimum bet size, and calculates current equity.
• Dynamic Position Sizing: Depending on the value of MoneyManagement, the position size adjusts:
  • Mode 0: Keeps position size constant at the minimum bet size.
  • Mode 1: Adjusts position size based on a percentage of the current equity, allowing it to increase or decrease with changes in equity.
  • Mode 2: Similar to Mode 1 but the position size can only increase, never decrease, aiming for higher profits at the potential cost of higher drawdowns.
• Rounding: Position sizes are rounded to two decimal places to ensure compatibility with platforms like IG that may require specific formatting.

This approach allows traders to scale their risk according to the performance of their strategy, potentially protecting gains and limiting losses dynamically.