diff --git a/src/main/java/millions/controller/fileIO/CSV/CSVStockFileParser.java b/src/main/java/millions/controller/fileIO/CSV/CSVStockFileParser.java
index 2a5d1ae..04e80db 100644
--- a/src/main/java/millions/controller/fileIO/CSV/CSVStockFileParser.java
+++ b/src/main/java/millions/controller/fileIO/CSV/CSVStockFileParser.java
@@ -21,7 +21,7 @@ public CSVStockFileParser() {}
   public boolean verifyCSV(List<String> lines) {
     return lines.stream()
         .filter(l -> !(l.startsWith("#") || l.isBlank()))
-        .noneMatch(l -> l.split(",").length != 3);
+        .noneMatch(l -> l.split(",").length != 4);
   }
 
   /**
@@ -49,9 +49,14 @@ public List<Stock> parse(List<String> lines) {
                   String symbol = split[0];
                   String company = split[1];
                   BigDecimal price = new BigDecimal(split[2]);
-                  stocks.add(new Stock(symbol, company, price));
+                  String[] functionValues = split[3].split(";");
+                  List<BigDecimal> convertedFunctionValues = new ArrayList<>();
+                  for (String functionValue : functionValues) {
+                    convertedFunctionValues.add(new BigDecimal(functionValue));
+                  }
+                  stocks.add(new Stock(symbol, company, price, convertedFunctionValues));
                 } catch (NumberFormatException e) {
-                  throw new InvalidFormatException("Error with number conversion on line: " + l + "\n" + "Last field must be a number");
+                  throw new InvalidFormatException("Error with number conversion on line: " + l + "\n" + "ensure all number fields are actually numbers");
                 } catch (IllegalArgumentException e) {
                   throw new InvalidFormatException("Illegal argument on line: " + l + "\n" + e.getMessage());
                 }
diff --git a/src/main/java/millions/model/Exchange.java b/src/main/java/millions/model/Exchange.java
index 55b2ab7..f96d2bb 100644
--- a/src/main/java/millions/model/Exchange.java
+++ b/src/main/java/millions/model/Exchange.java
@@ -10,6 +10,8 @@
 import java.util.Map;
 import java.util.Random;
 import java.util.stream.Collectors;
+
+import millions.model.calculators.PriceChangeCalculator;
 import millions.model.factories.PurchaseFactory;
 import millions.model.factories.SaleFactory;
 import millions.model.factories.TransactionFactory;
@@ -143,15 +145,19 @@ public List<Stock> getLosers(int limit) {
    * Advances the current game week by performing new price calculations for all stocks.
    */
   public void advance() {
+    PriceChangeCalculator  priceChangeCalculator = new PriceChangeCalculator();
     this.weekNumber++;
     for (Stock stock : this.stocks.values()) {
-      double change = 0.9 + random.nextDouble() * 0.2;
-      stock.addNewSalesPrice(
-          stock
-              .getSalesPrice()
-              .multiply(BigDecimal.valueOf(change))
-              .setScale(2, RoundingMode.HALF_UP));
-      // RoundingMode from AI suggestion
+      BigDecimal change = priceChangeCalculator.calculateChange(stock);
+      stock.addNewSalesPrice(stock.getSalesPrice().add(change));
+
+    //  double change = 0.9 + random.nextDouble() * 0.2;
+    //  stock.addNewSalesPrice(
+    //      stock
+    //          .getSalesPrice()
+    //          .multiply(BigDecimal.valueOf(change))
+    //          .setScale(2, RoundingMode.HALF_UP));
+    //  // RoundingMode from AI suggestion
     }
     notifyWeekAdvanced();
   }
diff --git a/src/main/java/millions/model/Stock.java b/src/main/java/millions/model/Stock.java
index cc1a23f..95954e1 100644
--- a/src/main/java/millions/model/Stock.java
+++ b/src/main/java/millions/model/Stock.java
@@ -8,19 +8,27 @@
 public class Stock {
   String symbol;
   String company;
+  List<BigDecimal> volatility;
   List<BigDecimal> prices;
 
   /**
    * @param symbol Stock ticker symbol
    * @param company company name
    * @param prices List of prices
+   * @param volatilityParameters numbers used for price change calculation functions
    * @throws IllegalArgumentException
    */
-  public Stock(String symbol, String company, List<BigDecimal> prices) {
+  public Stock(String symbol, String company, List<BigDecimal> prices, List<BigDecimal> volatilityParameters) {
     this.symbol = symbol;
     this.company = company;
     this.prices = new ArrayList<>(prices);
 
+    this.volatility = volatilityParameters;
+
+    if (volatilityParameters.size() != 5) {
+      throw new IllegalArgumentException("Invalid volatility function count");
+    }
+
     if (symbol == null || symbol.isBlank()) {
       throw new IllegalArgumentException("Symbol cannot be null or blank");
     }
@@ -31,8 +39,8 @@ public Stock(String symbol, String company, List<BigDecimal> prices) {
   }
 
   /** Stock() with single price instead of list */
-  public Stock(String symbol, String company, BigDecimal initialPrice) {
-    this(symbol, company, new ArrayList<>(List.of(initialPrice)));
+  public Stock(String symbol, String company, BigDecimal initialPrice, List<BigDecimal> volatilityFunctions) {
+    this(symbol, company, new ArrayList<>(List.of(initialPrice)), volatilityFunctions);
   }
 
   /**
@@ -110,6 +118,10 @@ public BigDecimal getLatestPriceChange() {
     return currentPrice.subtract(lastPrice);
   }
 
+  public List<BigDecimal> getVolatilityParameters() {
+    return this.volatility;
+  }
+
   @Override
   public String toString() {
     return "Stock [symbol: " + symbol + ", company: " + company + ", prices: " + prices + "]";
diff --git a/src/main/java/millions/model/calculators/PriceChangeCalculator.java b/src/main/java/millions/model/calculators/PriceChangeCalculator.java
new file mode 100644
index 0000000..c9b3074
--- /dev/null
+++ b/src/main/java/millions/model/calculators/PriceChangeCalculator.java
@@ -0,0 +1,56 @@
+package millions.model.calculators;
+
+import millions.model.Stock;
+
+import java.math.BigDecimal;
+import java.util.List;
+
+public class PriceChangeCalculator {
+
+  public PriceChangeCalculator() {}
+
+  public BigDecimal calculateChange(Stock stock) {
+    BigDecimal change = BigDecimal.ZERO;
+    List<BigDecimal> volatilityParameters = stock.getVolatilityParameters();
+    change = change.add(upChange(volatilityParameters.get(0)));
+    change = change.add(downChange(volatilityParameters.get(1)));
+    change = change.add(randomChange(volatilityParameters.get(2)));
+    change = change.add(sinChange(volatilityParameters.get(3)));
+    change = change.add(cosChange(volatilityParameters.get(4)));
+    return change;
+  }
+
+  private BigDecimal upChange(BigDecimal input) {
+    if (input.equals(BigDecimal.ZERO)) {
+      return BigDecimal.ZERO;
+    }
+    return input;
+
+  }
+  private BigDecimal downChange(BigDecimal input) {
+    if (input.equals(BigDecimal.ZERO)) {
+      return BigDecimal.ZERO;
+    }
+    return input.negate();
+  }
+
+  private BigDecimal randomChange(BigDecimal input) {
+    if (input.equals(BigDecimal.ZERO)) {
+      return BigDecimal.ZERO;
+    }
+    return new BigDecimal(Math.random()*10).multiply(input);
+  }
+
+  private BigDecimal sinChange(BigDecimal input) {
+    if (input.equals(BigDecimal.ZERO)) {
+      return BigDecimal.ZERO;
+    }
+    return new BigDecimal(Math.sin(input.doubleValue()));
+  }
+  private BigDecimal cosChange(BigDecimal input) {
+    if (input.equals(BigDecimal.ZERO)) {
+      return BigDecimal.ZERO;
+    }
+    return new BigDecimal(Math.cos(input.doubleValue()));
+  }
+}