diff --git a/x/auction/simulation/decoder.go b/x/auction/simulation/decoder.go
index a64f8744..232fc005 100644
--- a/x/auction/simulation/decoder.go
+++ b/x/auction/simulation/decoder.go
@@ -1,12 +1,32 @@
 package simulation
 
 import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+
 	"github.com/cosmos/cosmos-sdk/codec"
 	cmn "github.com/tendermint/tendermint/libs/common"
+
+	"github.com/kava-labs/kava/x/auction/types"
 )
 
 // DecodeStore unmarshals the KVPair's Value to the corresponding auction type
 func DecodeStore(cdc *codec.Codec, kvA, kvB cmn.KVPair) string {
-	// TODO implement this
-	return ""
+	switch {
+	case bytes.Equal(kvA.Key[:1], types.AuctionKeyPrefix):
+		var auctionA, auctionB types.Auction
+		cdc.MustUnmarshalBinaryLengthPrefixed(kvA.Value, &auctionA)
+		cdc.MustUnmarshalBinaryLengthPrefixed(kvB.Value, &auctionB)
+		return fmt.Sprintf("%v\n%v", auctionA, auctionB)
+
+	case bytes.Equal(kvA.Key[:1], types.AuctionByTimeKeyPrefix),
+		bytes.Equal(kvA.Key[:1], types.NextAuctionIDKey):
+		auctionIDA := binary.BigEndian.Uint64(kvA.Value)
+		auctionIDB := binary.BigEndian.Uint64(kvB.Value)
+		return fmt.Sprintf("%d\n%d", auctionIDA, auctionIDB)
+
+	default:
+		panic(fmt.Sprintf("invalid %s key prefix %X", types.ModuleName, kvA.Key[:1]))
+	}
 }