diff --git a/src/Corporation/Actions.ts b/src/Corporation/Actions.ts
index 570de5d71..7358e25a8 100644
--- a/src/Corporation/Actions.ts
+++ b/src/Corporation/Actions.ts
@@ -15,7 +15,7 @@ import { EmployeePositions } from "./EmployeePositions";
 import { ResearchMap } from "./ResearchMap";
 import { isRelevantMaterial } from "./ui/Helpers";
 import { checkEnum } from "../utils/helpers/checkEnum";
-import { CityName } from "src/Locations/data/CityNames";
+import { CityName } from "../Locations/data/CityNames";
 
 export function NewIndustry(corporation: Corporation, industry: IndustryType, name: string): void {
   if (corporation.divisions.find(({ type }) => industry == type))
@@ -46,7 +46,7 @@ export function NewIndustry(corporation: Corporation, industry: IndustryType, na
   }
 }
 
-export function NewCity(corporation: Corporation, division: Industry, city: string): void {
+export function NewCity(corporation: Corporation, division: Industry, city: CityName): void {
   if (corporation.funds < CorporationConstants.OfficeInitialCost) {
     throw new Error("You don't have enough company funds to open a new office!");
   }
@@ -389,7 +389,7 @@ export function HireAdVert(corp: Corporation, division: Industry): void {
 export function MakeProduct(
   corp: Corporation,
   division: Industry,
-  city: string,
+  city: CityName,
   productName: string,
   designInvest: number,
   marketingInvest: number,
diff --git a/src/Corporation/Industry.ts b/src/Corporation/Industry.ts
index b27066d2f..4f0008dff 100644
--- a/src/Corporation/Industry.ts
+++ b/src/Corporation/Industry.ts
@@ -64,7 +64,7 @@ export class Industry {
   warehouses: Record<CityName, Warehouse | 0>;
 
   //Maps locations to offices. 0 if no office at that location
-  offices: { [key: string]: OfficeSpace | 0 } = {
+  offices: Record<CityName, OfficeSpace | 0> = {
     [CityName.Aevum]: 0,
     [CityName.Chongqing]: 0,
     [CityName.Sector12]: new OfficeSpace({
@@ -194,7 +194,7 @@ export class Industry {
 
       // Process offices (and the employees in them)
       let employeeSalary = 0;
-      for (const officeLoc of Object.keys(this.offices)) {
+      for (const officeLoc of Object.values(CityName)) {
         const office = this.offices[officeLoc];
         if (office) employeeSalary += office.process(marketCycles, corporation, this);
       }
diff --git a/src/Corporation/OfficeSpace.ts b/src/Corporation/OfficeSpace.ts
index 36b0325c3..674c7c60b 100644
--- a/src/Corporation/OfficeSpace.ts
+++ b/src/Corporation/OfficeSpace.ts
@@ -121,7 +121,7 @@ export class OfficeSpace {
       if (corporation.funds < 0 && industry.lastCycleRevenue < 0) {
         perfMult = Math.pow(0.995, marketCycles);
       } else if (corporation.funds > 0 && industry.lastCycleRevenue > 0) {
-        perfMult = Math.pow(1.005, marketCycles);
+        perfMult = Math.pow(0.999, marketCycles);
       }
 
       if (this.autoCoffee) {
diff --git a/src/Corporation/Product.ts b/src/Corporation/Product.ts
index 63aed2156..092f5aaf2 100644
--- a/src/Corporation/Product.ts
+++ b/src/Corporation/Product.ts
@@ -7,13 +7,14 @@ import { createCityMap } from "../Locations/createCityMap";
 
 import { Generic_fromJSON, Generic_toJSON, IReviverValue, Reviver } from "../utils/JSONReviver";
 import { getRandomInt } from "../utils/helpers/getRandomInt";
+import { CityName } from "../Locations/data/CityNames";
 
 interface IConstructorParams {
   name?: string;
   demand?: number;
   competition?: number;
   markup?: number;
-  createCity?: string;
+  createCity?: CityName;
   designCost?: number;
   advCost?: number;
   quality?: number;
@@ -50,7 +51,7 @@ export class Product {
   // Variables for handling the creation process of this Product
   fin = false; // Whether this Product has finished being created
   prog = 0; // Creation progress - A number between 0-100 representing percentage
-  createCity = ""; // City in which the product is/was being created
+  createCity = CityName.Sector12; // City in which the product is/was being created
   designCost = 0; // How much money was invested into designing this Product
   advCost = 0; // How much money was invested into advertising this Product
 
@@ -112,7 +113,7 @@ export class Product {
     this.dmd = params.demand ? params.demand : 0;
     this.cmp = params.competition ? params.competition : 0;
     this.mku = params.markup ? params.markup : 0;
-    this.createCity = params.createCity ? params.createCity : "";
+    this.createCity = params.createCity ? params.createCity : CityName.Sector12;
     this.designCost = params.designCost ? params.designCost : 0;
     this.advCost = params.advCost ? params.advCost : 0;
     this.qlt = params.quality ? params.quality : 0;
diff --git a/src/Corporation/ui/CityTabs.tsx b/src/Corporation/ui/CityTabs.tsx
index 2981e5f9a..a94d018fd 100644
--- a/src/Corporation/ui/CityTabs.tsx
+++ b/src/Corporation/ui/CityTabs.tsx
@@ -18,17 +18,24 @@ export function CityTabs(props: IProps): React.ReactElement {
   const division = useDivision();
   const [city, setCity] = useState(props.city);
 
-  const office = division.offices[city];
-  if (office === 0) {
-    setCity(CityName.Sector12);
-    return <></>;
+  let mainContent: JSX.Element;
+  if (city === "Expand") {
+    mainContent = <ExpandNewCity cityStateSetter={setCity} />;
+  } else {
+    const office = division.offices[city];
+    if (office === 0) {
+      setCity(CityName.Sector12);
+      return <></>;
+    }
+    mainContent = (
+      <Industry rerender={props.rerender} city={city} warehouse={division.warehouses[city]} office={office} />
+    );
   }
-
-  const canExpand =
-    Object.keys(division.offices).filter((cityName: string) => division.offices[cityName] === 0).length > 0;
+  const canExpand = Object.values(CityName).filter((cityName) => division.offices[cityName] === 0).length > 0;
   function handleChange(event: React.SyntheticEvent, tab: CityName | "Expand"): void {
     setCity(tab);
   }
+
   return (
     <>
       <Tabs variant="fullWidth" value={city} onChange={handleChange} sx={{ maxWidth: "65vw" }}>
@@ -37,18 +44,7 @@ export function CityTabs(props: IProps): React.ReactElement {
         )}
         {canExpand && <Tab label={"Expand"} value={"Expand"} />}
       </Tabs>
-
-      {city !== "Expand" ? (
-        <Industry
-          key={city}
-          rerender={props.rerender}
-          city={city}
-          warehouse={division.warehouses[city]}
-          office={office}
-        />
-      ) : (
-        <ExpandNewCity cityStateSetter={setCity} />
-      )}
+      {mainContent}
     </>
   );
 }
diff --git a/src/Corporation/ui/MaterialElem.tsx b/src/Corporation/ui/MaterialElem.tsx
index 67f250a7b..46783c5ec 100644
--- a/src/Corporation/ui/MaterialElem.tsx
+++ b/src/Corporation/ui/MaterialElem.tsx
@@ -21,10 +21,11 @@ import Paper from "@mui/material/Paper";
 import Button from "@mui/material/Button";
 import Box from "@mui/material/Box";
 import { LimitMaterialProductionModal } from "./modals/LimitMaterialProductionModal";
+import { CityName } from "../../Locations/data/CityNames";
 
 interface IMaterialProps {
   warehouse: Warehouse;
-  city: string;
+  city: CityName;
   mat: Material;
   rerender: () => void;
 }
diff --git a/src/Corporation/ui/modals/MakeProductModal.tsx b/src/Corporation/ui/modals/MakeProductModal.tsx
index 0bb46deca..dbdcc9987 100644
--- a/src/Corporation/ui/modals/MakeProductModal.tsx
+++ b/src/Corporation/ui/modals/MakeProductModal.tsx
@@ -11,6 +11,7 @@ import MenuItem from "@mui/material/MenuItem";
 import Select, { SelectChangeEvent } from "@mui/material/Select";
 import { KEY } from "../../../utils/helpers/keyCodes";
 import { NumberInput } from "../../../ui/React/NumberInput";
+import { CityName } from "../../../Locations/data/CityNames";
 
 interface IProps {
   open: boolean;
@@ -32,8 +33,8 @@ function productPlaceholder(type: string): string {
 export function MakeProductModal(props: IProps): React.ReactElement {
   const corp = useCorporation();
   const division = useDivision();
-  const allCities = Object.keys(division.offices).filter((cityName) => division.offices[cityName] !== 0);
-  const [city, setCity] = useState(allCities.length > 0 ? allCities[0] : "");
+  const allCities = Object.values(CityName).filter((cityName) => division.offices[cityName] !== 0);
+  const [city, setCity] = useState(allCities.length > 0 ? allCities[0] : CityName.Sector12);
   const [name, setName] = useState("");
   const [design, setDesign] = useState<number>(NaN);
   const [marketing, setMarketing] = useState<number>(NaN);
@@ -51,7 +52,7 @@ export function MakeProductModal(props: IProps): React.ReactElement {
   }
 
   function onCityChange(event: SelectChangeEvent<string>): void {
-    setCity(event.target.value);
+    setCity(event.target.value as CityName);
   }
 
   function onProductNameChange(event: React.ChangeEvent<HTMLInputElement>): void {
diff --git a/src/NetscriptFunctions/Corporation.ts b/src/NetscriptFunctions/Corporation.ts
index 94a3b2bfd..3f689d10a 100644
--- a/src/NetscriptFunctions/Corporation.ts
+++ b/src/NetscriptFunctions/Corporation.ts
@@ -223,7 +223,7 @@ export function NetscriptCorporation(): InternalAPI<NSCorporation> {
 
   function getOffice(divisionName: string, cityName: string): OfficeSpace {
     const division = getDivision(divisionName);
-    if (!(cityName in division.offices)) throw new Error(`Invalid city name '${cityName}'`);
+    if (!checkEnum(CityName, cityName)) throw new Error(`Invalid city name '${cityName}'`);
     const office = division.offices[cityName];
     if (office === 0) throw new Error(`${division.name} has not expanded to '${cityName}'`);
     return office;