diff --git a/src/app/models/Chain.ts b/src/app/models/Chain.ts
new file mode 100644
index 0000000..b1db4cd
--- /dev/null
+++ b/src/app/models/Chain.ts
@@ -0,0 +1,3 @@
+export class Chain {
+  constructor(public name: string | null, public image: string | null, public id?: number) {}
+}
diff --git a/src/app/models/Establishment.ts b/src/app/models/Establishment.ts
new file mode 100644
index 0000000..320ef32
--- /dev/null
+++ b/src/app/models/Establishment.ts
@@ -0,0 +1,5 @@
+import { Chain } from './Chain';
+
+export class Establishment {
+  constructor(public chain: Chain, public address = '', public id?: number) {}
+}
diff --git a/src/app/models/Product.ts b/src/app/models/Product.ts
new file mode 100644
index 0000000..82319ab
--- /dev/null
+++ b/src/app/models/Product.ts
@@ -0,0 +1,8 @@
+export class Product {
+  constructor(
+    public barcode: string,
+    public name = '',
+    public image: string | null = null,
+    public id?: number
+  ) {}
+}
diff --git a/src/app/models/ProductEstablisment.ts b/src/app/models/ProductEstablisment.ts
new file mode 100644
index 0000000..1ab452e
--- /dev/null
+++ b/src/app/models/ProductEstablisment.ts
@@ -0,0 +1,14 @@
+import { Establishment } from './Establishment';
+import { Product } from './Product';
+
+export class ProductEstablishment {
+  id?: number;
+  establishment: Establishment;
+  product: Product;
+
+  constructor(product: Product, establishment: Establishment, id?: number) {
+    this.id = id;
+    this.establishment = establishment;
+    this.product = product;
+  }
+}
diff --git a/src/app/models/Purchase.ts b/src/app/models/Purchase.ts
new file mode 100644
index 0000000..a3514ac
--- /dev/null
+++ b/src/app/models/Purchase.ts
@@ -0,0 +1,24 @@
+import { Establishment } from './Establishment';
+import { Product } from './Product';
+
+export class Purchase {
+  #price: number;
+  constructor(
+    public establishment: Establishment,
+    public product: Product,
+    price = 0,
+    public quantity = 1,
+    public date = Date.now(),
+    public id?: number
+  ) {
+    this.#price = price * 100;
+  }
+
+  get price() {
+    return this.#price / 100;
+  }
+
+  set price(price: number) {
+    this.#price = price * 100;
+  }
+}